Question

following world war ii, primarily what group was feared to be a source of communism in the u.s.?
women suffragists
african americans
immigrants

Explanation:

After WWII, during the Red Scare, immigrants (especially from communist - leaning regions) were feared as a source of communism. Women suffragists fought for voting rights (not related to communism fears post - WWII), and African Americans' struggles were for civil rights, not seen as a communist threat source. So immigrants were the group feared for communism.

Answer:

immigrants