The Crisis of 1956 was the most serious and critical situation the Party was in since its foundation. The making of the crisis attributed to the 20th Congress of the Communist Party of the Soviet Union, the Secret Report, and Hungarian Revolution, etc. As the members of the British Communist Party got to know the contents of the Secret Report, the Communist Party’s Historians’ Group emerged as the nucleus of vocal opposition to the Party. However, in order to keep the cooperation between international communism and the Party, the leadership of the British Communist Party suppressed free and public discussion on the questions raised by the 20th Congress of the Communist Party of the Soviet Union. This caused the dissatisfaction and ‘rebellion’ of the communist intellectuals. What’s worse, British Communist Party supported the Soviet Union’s army to invade Hungary, while the communist intellectuals required the Party to cut clear line with Soviet Union. With the leave of many members and intellectuals during the fierce competition, the Party suffered from the Crisis of 1956.