“In the mid-1970s, California Congresswoman Karen Bass, who is now under consideration to be Joe Biden’s running mate, was an organizer for the Venceremos Brigade… An event blurb in an October 1975 issue of the communist Daily World newspaper describes Bass, then 22, as “leader of the Venceremos Brigade in southern California….As a ‘brigadista’ and then organizer for the Venceremos Brigades, Karen visited Cuba every 6 months.” (Tablet magazine, 7/28.) In that heady Age of Aquarius hundreds of starry-eyed college kids were volunteering to “help build Cuban Socialism” and “fight U.S. Imperialism,” mostly by joyfully cutting Cuban sugar cane and...