
Anonymous is a decentralized international activist/hacktivist collective/movement widely known for its various cyberattacks against several governments, government institutions and government agencies, corporations, and the Church of Scientology.

The 2013 Singapore cyberattacks were a series of cyberattacks initiated by the hacktivist organisation Anonymous, conducted partly in response to web censorship regulations in Singapore. A member of Anonymous, known by the online handle "The Messiah", claimed responsibility for spearheading the attacks. On 12 November 2013, James Raj was charged in a Singapore court as the alleged "Messiah".

BlueLeaks, sometimes referred to by the Twitter hashtag #BlueLeaks, refers to 269 gigabytes of internal U.S. law enforcement data obtained by the hacker collective Anonymous and released on June 19, 2020, by the activist group Distributed Denial of Secrets, which called it the "largest published hack of American law enforcement agencies."

The February 2010 Australian cyberattacks were a series of denial-of-service attacks conducted by the Anonymous online community against the Australian government in response to proposed web censorship regulations. Operation Titstorm was the name given to the cyber attacks by the perpetrators. They resulted in lapses of access to government websites on 10 and 11 February 2010. This was accompanied by emails, faxes, and phone calls harassing government offices. The actual size of the attack and number of perpetrators involved is unknown but it was estimated that the number of systems involved ranged from the hundreds to the thousands. The amount of traffic caused disruption on multiple government websites.

The Guy Fawkes mask is a stylised depiction of Guy Fawkes, the best-known member of the Gunpowder Plot, an attempt to blow up the House of Lords in London on 5 November 1605. The use of a mask on an effigy has long roots as part of Guy Fawkes Night celebrations.

The Hacker Wars is a 2014 documentary film about hacktivism in the United States, directed by Vivien Lesnik Weisman. It was released on October 17, 2014 in the US.

Low Orbit Ion Cannon (LOIC) is an open-source network stress testing and denial-of-service attack application, written in C#. LOIC was initially developed by Praetox Technologies, but was later released into the public domain, and now is hosted on several open source platforms.

Lulz Security, commonly abbreviated as LulzSec, was a black hat computer hacking group that claimed responsibility for several high profile attacks, including the compromise of user accounts from PlayStation Network in 2011. The group also claimed responsibility for taking the CIA website offline. Some security professionals have commented that LulzSec has drawn attention to insecure systems and the dangers of password reuse. It has gained attention due to its high profile targets and the sarcastic messages it has posted in the aftermath of its attacks. One of the founders of LulzSec was computer security specialist Hector Monsegur, who used the online moniker Sabu. He later helped law enforcement track down other members of the organization as part of a plea deal. At least four associates of LulzSec were arrested in March 2012 as part of this investigation. British authorities had previously announced the arrests of two teenagers they allege are LulzSec members T-flow and Topiary.

The Million Mask March, also known as "Operation Vendetta", is a worldwide, annual protest associated with the hacktivist group Anonymous occurring annually on Guy Fawkes Day, 5 November. The motive for the March varies, but includes some consistent themes prevalent in the Anonymous movement, including: corruption in politics, demilitarization, police violence, and self-governance. The marches are set in motion to allow ordinary citizens to collaborate in order to create societal change through alterations to their governments. They are coordinated through a host of channels with most prevalent being word of mouth and social media. Hundreds of Facebook events and dedicated Twitter accounts are used to advertise the protest around the world.

Minds is an alt-tech blockchain-based social network. Users can earn money or cryptocurrency for using Minds, and tokens can be used to boost their posts or crowdfund other users. Minds has been described as more privacy-focused than mainstream social media networks. Writers in The New York Times, Engadget, and Vice have noted the volume of far-right users and content on the platform. Minds describes itself as focused on free speech, and minimally moderates the content on its platform. Its founders have said that they do not remove extremist content from the site out of a desire to deradicalize those who post it through civil discourse.
The Monument to the Soviet Army is a monument located in Sofia, the capital of Bulgaria. There is a large park around the statue and the surrounding areas. It is a popular place where many young people gather. The monument is located on Tsar Osvoboditel Boulevard, near Orlov Most and the Sofia University. It portrays a soldier from the Soviet Army as a freedom fighter, surrounded by a Bulgarian woman, holding her baby, and a Bulgarian man. There are other, secondary sculptural composition parts of the memorial complex around the main monument, like the group of soldiers which have been used many times as a canvas by political artists. The monument was built in 1954 on the occasion of the 10th anniversary of the liberation by the Soviet Army, which is the general Russian interpretation of the complex Military history of Bulgaria during World War II.

Operation Anti-Security, also referred to as Operation AntiSec or #AntiSec, is a series of hacking attacks performed by members of the hacking group LulzSec and Anonymous, and others inspired by the announcement of the operation. LulzSec performed the earliest attacks of the operation, with the first against the Serious Organised Crime Agency on 20 June 2011. Soon after, the group released information taken from the servers of the Arizona Department of Public Safety; Anonymous would later release information from the same agency two more times. An offshoot of the group calling themselves LulzSecBrazil launched attacks on numerous websites belonging to the Government of Brazil and the energy company Petrobras. LulzSec claimed to retire as a group, but on 18 July they reconvened to hack into the websites of British newspapers The Sun and The Times, posting a fake news story of the death of the publication's owner Rupert Murdoch.

Operation Payback was a coordinated, decentralized group of attacks on high-profile opponents of Internet piracy by Internet activists using the "Anonymous" moniker. Operation Payback started as retaliation to distributed denial of service (DDoS) attacks on torrent sites; piracy proponents then decided to launch DDoS attacks on piracy opponents. The initial reaction snowballed into a wave of attacks on major pro-copyright and anti-piracy organizations, law firms, and individuals.

Operation Nigeria or by the abbreviation OpNigeria is a group created by members of Anonymous. The members that took part in the EndSars movement were LiteMods, WhiteRabbitGang, YounesAnonymous, NigeriaOp, LorianSynaro, YourAnonNews and HackDown2. The members include numerous hackers or hacking groups who in 2020 supported the EndSARS movement that is going on in Nigeria. The group has hacked multiple Nigerian government websites and banks as well.
Project Chanology was a protest movement against the practices of the Church of Scientology by members of Anonymous, a leaderless Internet-based group. The project was started in response to the Church of Scientology's attempts to remove material from a highly publicized interview with Scientologist Tom Cruise from the Internet in January 2008.

We Are Legion: The Story of the Hacktivists is a 2012 documentary film about the workings and beliefs of the self-described "hacktivist" collective, Anonymous.