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1934 West Coast waterfront strike, the International Seamen's Union and the Marine Transport Workers (MTW) of the Industrial Workers of the World (IWW) joined the strike, but the "Communist-dominated MWIU undercut the strike" by scabbing.<unk>1934 West Coast waterfront strike, the International Seamen's Union and the Marine Transport Workers (MTW) of the Industrial Workers of the World (IWW) joined the strike, but the "Communist-dominated MWIU undercut the strike" by scabbing.