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In the United States, John George and Laird Wilcox have identified the Communist Party USA, Socialist Workers Party, Black Panther Party, Students for a Democratic Society and Progressive Labor Party as some of the groups active on what he refers to as the "far-left".
Notably, the Progressive Labor Party (PLP) organized a coordinated, violent assault against ROAR when ROAR attempted to disrupt PLP's 1975 May Day march with massive resistance.