
Alpha 66 is an anti-Castro paramilitary organization that operates in the Southern United States. The group was originally formed by Cuban exiles in the early 1960s and was most active in the late 1970s and 1980s. Although its base of support has greatly eroded due to the end of the Cold War and the thawing of relations between the United States and Cuba, Alpha 66 is still active today and is recognized as a terrorist organization by state governments and research groups alike.

WHYU-LP is a low-power radio station operated by the American Militia Association in Meyersdale, Pennsylvania. It claims to be the "only FCC licensed FM broadcast station operated by a militia related organization in the United States" as of December 2019.

Arizona Border Recon (AZBR) is an American paramilitary militia group in Arizona composed of former military, law enforcement and private security contractors.

Army of God (AOG) is an American Christian terrorist organization, members of which have perpetrated anti-abortion violence. According to the Department of Justice and Department of Homeland Security's joint Terrorism Knowledge Base, the Army of God is an active underground terrorist organization in the United States. In addition to numerous property crimes, the group has committed acts of kidnapping, attempted murder, and murder. The AOG was formed in 1982 and, while sharing a common ideology and tactics, the group's members claim that they rarely communicate with each other; this is known more formally as leaderless resistance. The group forbids those who wish to "take action against babykilling abortionists" from discussing their plans with anyone in advance.

The Atomwaffen Division, also known as the National Socialist Order, is a neo-Nazi terrorist network. Formed in 2015 and based in the Southern United States, it has since expanded across the United States and into the United Kingdom, Canada, Germany, the Baltic states and other European countries. The group is described as part of the alt-right by some journalists, although the group rejects the label and is considered extreme even within that movement. It is listed as a hate group by the Southern Poverty Law Center (SPLC), and a terrorist group by multiple governments, including the United Kingdom, and Canada.

The Base is a neo-Nazi, white supremacist and accelerationist paramilitary hate group and training network, formed in 2018 by Rinaldo Nazzaro and active in the United States, Canada, Australia, South Africa, and Europe. It is considered a terrorist group in Canada and the United Kingdom. Nazzaro, who used to work for the FBI and the Pentagon, moved to Russia around the time he created The Base, and directs the group's activities from there. In November 2020, a feature-length interview with Nazzaro was broadcast on Russian state television.

The Black Legion was a white supremacist terrorist organization active in the Midwestern United States during the Great Depression of the 1930s. It split off from the Ku Klux Klan. According to historian Rick Perlstein, the FBI estimated its membership "at 135,000, including a large number of public officials, possibly including Detroit’s police chief." In 1936 the group was suspected of having killed as many as 50 people, according to the Associated Press, including Charles Poole, an organizer for the federal Works Progress Administration.

The boogaloo movement, whose adherents are often referred to as boogaloo boys or boogaloo bois, is a loosely organized far-right anti-government extremist movement in the United States. It has also been described as a militia. Adherents say they are preparing for, or seek to incite, a second American Civil War or second American Revolution which they call "the boogaloo".

The Branch Davidians were a religious cult founded in 1955 by Benjamin Roden. They regard themselves as a continuation of the General Association of Davidian Seventh-Day Adventists, established by Victor Houteff in 1935.

The Christian Patriot movement is a tendency within the broader American Patriot movement that emphasizes Christian nationalism. Like the larger movement, it promotes a revisionist interpretation of American history in which the federal government has turned against the ideas of liberty and natural rights expressed in the American Revolution.

Citizens for Constitutional Freedom (C4CF), later also known as People for Constitutional Freedom (P4CF), was the name taken on January 4, 2016, by an armed private U.S. militia that occupied the U.S. Fish and Wildlife Service's Malheur National Wildlife Refuge headquarters in the U.S. state of Oregon from January 2 to February 11, 2016. The leader of the organization was Ammon Bundy, son of Cliven D. Bundy, who engaged in a standoff with the federal government over grazing rights on federal land.

The Constitutional Sheriffs and Peace Officers Association (CSPOA) is a political organization of local police officials in the United States who believe that federal and state government authorities are subordinate to local government authority. Self-described "constitutional sheriffs" believe that sheriffs are the highest governmental authority and that they have the power and duty to defy or disregard laws they deem unconstitutional. The movement is related to previous "nullification" and "interposition" notions, and promotes such efforts. It has been described as far-right by the Southern Poverty Law Center. The CSPOA has claimed a membership of 400.

The Covenant, the Sword, and the Arm of the Lord (CSA) was a far-right militant organization dedicated to Christian Identity and survivalism active in the United States during the 1970s and early 1980s. The CSA developed from a Baptist congregation, the Zarephath-Horeb Community Church, which was founded in 1971 in Pontiac, Missouri. Over time, Zarephath-Horeb evolved into an extremist paramilitary organization and it was rechristened the CSA. The group operated a large compound in northern Arkansas called "the Farm". In April 1985, law enforcement officers who were investigating the group for weapons violations and terrorist acts carried out a siege of the compound. After a peaceful resolution, officers arrested and later convicted the CSA's top leaders, and the organization dissolved.

Hutaree is a militia movement group adhering to the ideology of the Christian Patriot movement, based near Adrian, Michigan, in the United States. The group formed in early 2006. The name "Hutaree" appears to be a neologism; the group's website says that the name means "Christian warriors", but an investigation by the FBI concluded the word doesn't have a Christian background. The group became widely known in 2010 after the United States FBI prosecuted them in federal court for an alleged plan for violent revolt. The prosecution said they intended to kill a police officer and to attack the funeral with bombs. The presiding judge dismissed these charges. Three members pleaded guilty to possessing a machine gun and were sentenced to time served.

The Idaho Light Foot Militia (ILFM) is a privately organized militia in the state of Idaho. The Idaho Light Foot Militia is distinct from a state defense force in that it is not recognized as part of the organized militia by the government of Idaho, but is rather privately organized by private citizens in the unorganized militia. The ILFM was founded in 2009.

The Militia of Montana (MOM) is a paramilitary organization founded by David and John Trochmann of Noxon, Montana, United States. The organization formed from the remnants of the United Citizens for Justice in late 1992 in response to the standoff during the siege in Ruby Ridge, Idaho. The Militia of Montana reached their member high point in 1999 and largely disbanded after the Y2K threat turned out to be minor.

The Minuteman Civil Defense Corps was a volunteer group at one time headed by Chris Simcox and dedicated to preventing illegal crossings of the United States border. Arguing that the government is insufficiently concerned with securing the U.S. border, they have organized several state chapters, with the intention of providing law enforcement agencies with evidence of immigration law violations. The group was one of several that emerged for the proliferation of civilian border patrol groups at the US-Mexico border. It is shown that the emergence of these groups can be linked, on the one hand, to an increasing criminalization and securitization of immigration.Simcox states that the group merely reports incidents to law enforcement, and does not directly confront immigrants. There is a standard operating procedure (SOP) that must be followed by Minutemen volunteers. Rules include not speaking to, approaching, gesturing towards or having physical contact in any way with any suspected border crossers they may see. The organization has been criticized as being a right-wing militia.

The Minuteman Project was an organization which was founded in the United States in August 2004 by a group of private individuals who sought to extrajudicially monitor the United States–Mexico border's flow of illegal immigrants. Founded by Jim Gilchrist and Chris Simcox, the organization's name is derived from the name of the Minutemen, militiamen who fought in the American Revolution. The Minuteman Project describes itself as "a citizens' Neighborhood Watch on our border", and it has attracted the attention of the media due to its focus on the issue of illegal immigration.

The Missouri Citizens Militia (MCM) is a private militia in the U.S. state of Missouri.

The Missouri Militia is a private, non-profit civilian defense organization in the U.S. state of Missouri. The Missouri Militia is not a part of the Missouri State Defense Force. which is the state defense force for the state of Missouri. Its members have been active in disaster relief after the 2011 Joplin tornado.

Oath Keepers is an American far-right anti-government militia organization composed of current and former military and police who claim to be defending the Constitution of the United States. It encourages its members to disobey orders which they believe would violate the U.S. Constitution. While the organization claims a membership of 35,000 as of 2016, researchers estimate its actual membership as probably no higher than 5,000.

On January 2, 2016, an armed group of far-right extremists seized and occupied the headquarters of the Malheur National Wildlife Refuge in Harney County, Oregon, and continued to occupy it until law enforcement made a final arrest on February 11, 2016. Their leader was Ammon Bundy, who participated in the 2014 Bundy standoff at his father's Nevada ranch. Other members of the group were loosely affiliated with non-governmental militias and the sovereign citizen movement.

Patriot Prayer is a far-right group founded by Joey Gibson in 2016 and based in Vancouver, Washington, a suburban city in the Portland metropolitan area. Since 2016, the group has organized several dozen pro-gun, pro-Trump rallies held in liberal cities in the Pacific Northwest and Northern California. Often met with large numbers of counter-protesters, attendees have repeatedly clashed with left-wing groups in the Portland area. Far-right groups, such as Proud Boys, have attended the rallies organized by Patriot Prayer, as well as White nationalists, sparking controversy and violence.

The Red Shirts or Redshirts of the Southern United States were white supremacist paramilitary terrorist groups that were active in the late 19th century in the last years of, and after the end of, the Reconstruction era of the United States. Red Shirt groups originated in Mississippi in 1875, when anti-Reconstruction private terror units adopted red shirts to make themselves more visible and threatening to Southern Republicans, both whites and freedmen. Similar groups in the Carolinas also adopted red shirts.

The Republic of Texas is a general term for several organizations, some of which have been called militia groups, that claim the annexation of Texas by the United States was illegal and that Texas remains an independent nation to this day but is under occupation. The issue of the legal status of Texas led the group to claim to have reinstated a provisional government on December 13, 1995. Activists within the movement claim over 40,000 active supporters, and public opinion polls have shown significant support for the secession of Texas or other states. A September 2014 Reuters/Ipsos poll found over 34% of people in southwestern states favored their own state seceding from the United States. So far, however, supporters have not managed to turn these public sentiments into concrete moves toward an independent Texas.

Jon Eric Ritzheimer is an American political activist. He is affiliated with the 3 Percenters and formerly associated with the Oath Keepers group, and has used social media to declare his opposition to Islam and the Bureau of Land Management.

Ruby Ridge was the site of an eleven-day siege in 1992 in Boundary County, Idaho, near Naples. It began on August 21, when deputies of the United States Marshals Service (USMS) initiated action to apprehend and arrest Randy Weaver under a bench warrant after his failure to appear on firearms charges. Given three conflicting dates for his court appearance, and suspecting a conspiracy against him, Weaver refused to surrender, and members of his immediate family, and family friend Kevin Harris, resisted as well. The Hostage Rescue Team of the Federal Bureau of Investigation became involved as the siege developed.

The Three Percenters, also styled 3 Percenters, 3%ers and III%ers, are an American and Canadian far-right, anti-government militia movement.

White Aryan Resistance (WAR) is a white supremacist neo-Nazi organization in the United States founded and formerly led by former Ku Klux Klan Grand Dragon Tom Metzger. It is based in Warsaw, Indiana, and is incorporated as a business.

The White League, also known as the White Man's League, was a white paramilitary terrorist organization started in the Southern United States in 1874 to intimidate freedmen into not voting and politically organizing. Its first chapter was formed in Grant Parish, Louisiana, and neighboring parishes and was made up of many of the Confederate veterans who had participated in the Colfax massacre in April 1873. Chapters were soon founded in New Orleans and other areas of the state.

Whitecapping was a movement among farmers that occurred specifically in the United States during the late 19th and early 20th centuries. It was originally a ritualized form of extralegal actions to enforce community standards, appropriate behavior, and traditional rights. However, as it spread throughout the poorest areas of the rural South after the Civil War, white members operated from economically driven and anti-black biases. States passed laws against it, but whitecapping continued into the early 20th century.