The Squad, nicknamed the Twelve Apostles, was an Irish Republican Army (IRA) unit founded by Michael Collins to counter British intelligence efforts during the Irish War of Independence, mainly by means of assassination. The Squad engaged in executing informants, police active in harassment of IRA personnel, enemy agents and worked in counterespionage.

Michael Collins was an Irish revolutionary, soldier and politician who was a leading figure in the early-20th century struggle for Irish independence. During the War of Independence he was Director of Intelligence of the Irish Republican Army (IRA) and a government minister of the self-declared Irish Republic. He was then Chairman of the Provisional Government of the Irish Free State from January 1922 and commander-in-chief of the National Army from July until his death in an ambush in August 1922, during the Civil War.