
Densho is a nonprofit organization based in Seattle, Washington whose mission is “to preserve and share history of the WWII incarceration of Japanese Americans to promote equity and justice today.” Densho collects video oral histories, photos, documents, and other primary source materials regarding Japanese American history, with a focus on the incarceration of Japanese Americans during World War II. Densho offers a free digital archive of these primary sources, in addition to an online encyclopedia and curricula, for educational purposes.

Executive Order 9066 was a United States presidential executive order signed and issued during World War II by United States president Franklin D. Roosevelt on February 19, 1942. This order authorized the secretary of war to prescribe certain areas as military zones, clearing the way for the incarceration of Japanese Americans, German Americans, and Italian Americans in U.S. concentration camps.

Internment of German resident aliens and German-American citizens occurred in the United States during the periods of World War I & World War II. During World War II, the legal basis for this detention was under Presidential Proclamation 2526, made by President Franklin Delano Roosevelt under the authority of the Alien Enemies Act.

The National Emergencies Act (NEA) is a United States federal law passed to end all previous national emergencies and to formalize the emergency powers of the President.

The Palmer Raids were a series of raids conducted in November 1919 and January 1920 during the First Red Scare by the United States Department of Justice under the administration of President Woodrow Wilson to capture and arrest suspected leftists, mostly Italian and Eastern European immigrants and especially anarchists and communists, and deport them from the United States. The raids particularly targeted Italian immigrants and Eastern European Jewish immigrants with alleged leftist ties, with particular focus on Italian anarchists and immigrant leftist labor activists. The raids and arrests occurred under the leadership of Attorney General A. Mitchell Palmer, with 3,000 arrested. Though 556 foreign citizens were deported, including a number of prominent leftist leaders, Palmer's efforts were largely frustrated by officials at the U.S. Department of Labor, which had authority for deportations and objected to Palmer's methods.

The 2006 Swift raids were a coordinated effort by U.S. Immigration and Customs Enforcement (ICE) to detain and deport people who are undocumented.

The YFZ Ranch, or Yearning for Zion Ranch, was a 1,700-acre (7 km2) Fundamentalist Church of Jesus Christ of Latter-Day Saints (FLDS) community of as many as 700 people, located near Eldorado in Schleicher County, Texas, United States. As of April 2014, the State of Texas took physical and legal possession of the property.