The 43 Group was an English anti-fascist group set up by Jewish ex-servicemen after World War II. They did this when, upon returning to London, they encountered British fascist organisations such as Jeffrey Hamm's British League of Ex-Servicemen and later Oswald Mosley's new fascist party, the Union Movement. The activities of these fascist groups included antisemitic speeches in public places, and from the rank-and-file fascists, violent attacks on London Jews and Jewish property. Group members broke up far-right meetings, infiltrated fascist groups, and attacked the fascists in street fighting.
The title "43 Group" came from the number of people in the room of Maccabi House during the group's founding meeting. Those who convened the initial meeting included:
The 17-year-old Vidal Sassoon joined the group in 1947, and joined the Israeli Defence Forces to fight in the 1948 Arab-Israeli War. Sassoon later founded a multinational hair styling business.
The initial membership was around 300 people. The group grew to include many hundreds of men and women, not all Jewish. Many among them were decorated for bravery, including the VC (Petty Officer Tommy Gould), DSO, DFC, DSM, and MM. The organisation was sometimes portrayed by its enemies as a front for either Jewish terrorists or communists, but in fact it was mostly composed of British ex-servicemen.