Entryism

Entryism, or entrism, also known as 'the French tactic', is a political tactic whereby members of one political party enter a second, larger, party en masse with the aim of 'capturing' the larger party for their viewpoint. It is commonly, although not exclusively, practiced by parties of the extreme left, epitomised by the activities of Militant Tendency in the British Labour Party in the 1970s and 1980s. Some far right parties also practice entryism, but the tactic is disdained by democratic parties and respectable political organisations.

Examples of Entryism

• Revolutionary Communist Party (UK) entering the Independent Labour Party (1940s)
• Revolutionary Communist Party (UK) entering the Labour Party (1940s/50s)
• Militant Tendency entering the Labour Party (1970s/80s)