Do an NGRAM search for such terms as “leftist” and “rightist” or “left deviationist” or “right deviationist” or “left winger” or “right winger”, etc. and it becomes crystal clear that the language of “left” and “right” come into the English language and American conversation in the 1920s and especially the 1930s.
Do a search of a . . . → Read More: NGRAM: “Left” & “Right” in OUR modern vocabulary comes out of Moscow and the Comintern

