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He was active in the Minneapolis Teamsters Strike of 1934 led by the Communist League of America and later became a member of the Socialist Workers Party and as a leading member of the SWP he was imprisoned under the Smith Act together with many other SWP leaders for opposing the US involvement in the Second World War.
A number of militant members, including several Communist Party members who had gone to the newly formed Communist League of America (Left Opposition) in the internal split following Trotsky's expulsion, became members of Local 574 in the early 1930s.