Maximilian "Max" Cohen was an American socialist politician of the early 20th Century. Cohen held a series of important posts during the pivotal year of 1919, including Secretary of the Left Wing Section of the Socialist Party for Local Greater New York, Secretary of the Left Wing National Council, and business manager for the New York Communist. Cohen was also a founding member of the Communist Party of America in that same year.
Maximilian Cohen was born in the United States of ethnic Jewish parents. He grew up in New York City and became actively involved in radical politics as a very young man, joining the Socialist Labor Party in 1904 before moving to the Socialist Party of America in 1913. He trained and worked professionally as a dentist.
In 1919, with the emergence of an organized revolutionary socialist Left Wing faction in the Socialist Party, Cohen cast his lot with the insurgents. In January 1919 a joint meeting of representatives of all the SP branches of Local Greater New York was called. The meeting was chaired by Julius Gerber, Executive Secretary of Local Greater New York who did his best to steer the meeting away from the passionate discussion of strategy and tactics which the Left Wing members desired. When delegates from Queens attempted to win the floor at 11:30 pm, only to be ruled out of order, a number of radicals bolted the hall and gathered in a meeting room of their own. A City Committee of 14 was elected, with Max Cohen as Executive Secretary. The group was to compose a manifesto and wage a campaign to win over the rank and file of the party to the ideas of revolutionary socialism. It was this group which wrote the famous Left Wing Manifesto, a document extensively revised by Louis C. Fraina, editor of the weekly newspaper of the Left Wing Section, Local Boston, The Revolutionary Age.