MM&amp;P was active in the 1934 West Coast waterfront strike, joining in along with the Marine Engineers' Beneficial Association (MEBA) on 19 May 1934. Together, in 1937 the two unions became part of the Maritime Federation of the Pacific (MFP). The alliance, however, was short-lived. In July 1938, MM&amp;P withdrew from the MFP, along with the Sailors' Union of the Pacific and the Marine Firemen, Oilers, Watertenders, and Wipers of the Pacific Coast Union.