
The Association of Victims of Terrorism is a Spanish association created in 1981 by victims of terrorist attacks. Its members include those injured by ETA, GRAPO, the Provisional Irish Republican Army and Al Qaeda, as well as their families. It does not, however, include victims of extreme right Spanish groups such as GAL, Warriors of Christ the King and others. Its membership exceeds 6,000.
The Canary Islands Independence Movement (CIIM), also known as the Movement for the Independence and Self-determination of the Canaries Archipelago, was an independentist organization that had a radio station in Algiers and resorted to violence in attempts to force the Spanish government to create an independent state in the Canary Islands.

The assassination of Prime Minister Luis Carrero Blanco, also known by its code name Operación Ogro had far-reaching consequences within the politics of Spain. Admiral Carrero Blanco was killed in Madrid by the Basque separatist group ETA on 20 December 1973. The assassination is considered to have been the biggest attack against the Francoist State since the end of the Spanish Civil War in 1939.

The First of October Anti-Fascist Resistance Groups was a Spanish clandestine Marxist Leninist group aiming for the formation of a Spanish Republican state.
The Guanche Armed Forces was the armed wing of the Movement for the Self- Determination and Independence of the Canarian Archipelago, Spanish: Movimiento por la Autodeterminación e Independencia del Archipiélago Canario (MPAIAC). It was active between 1 November 1976 and late 1978, when the group unilaterally announced a "ceasefire" in what it considered to be "struggle against Spanish colonial occupation" of the Canary Islands.

Arkaitz Goikoetxea Basabe is a member of the Basque separatist organisation ETA. He began his violent activity at the age of 15 as a member of the street violence groups known as kale borroka. He was arrested several times between 2001 and 2002, and joined ETA in 2005.

The Red Terror in Spain is the name given by some historians to various acts of violence committed from 1936 until the end of the Spanish Civil War by sections of nearly all the leftist groups. News of the rightist military coup in July 1936 unleashed a revolutionary response, and no Republican region escaped revolutionary and anticlerical violence, although it was minimal in the Basque Country. The violence consisted of the killing of tens of thousands of people, attacks on the Spanish nobility, industrialists, and conservative politicians, as well as the desecration and burning of monasteries and churches.

Segi is a Basque pro-independence and revolutionary left-wing organization. It forms part of the Basque National Liberation Movement and is aligned with Langile Abertzaleen Batzordeak and Batasuna.