The Socialist Party in the US has been an enemy of the state since European immigrants brought the ideology and union organizing principles to these shores. Casual labor  historians recognize, too, that "party" contribution to formation of the CIO -- at the time a "radical" response to AFL political and cultural hegemony, nativisim really.

Does the name John Lewis (not a card-carrier) ring a bell? It should. FDR put him on the first NLRB panel.

Diversity is the key to economic and political evolution.