Looked for the precise reference on Ask/Google/et al. but came up empty. I know the quote can be found in one of Omar Kazemzadeh's Russian history texts (because I used it in college).
And the comrade soon wound up in front of a firing squad, charged with `deviationist separatism’.
P.C. = Marxism-Leninism = totalitarian thought control.
I remember being at an Army school back in the early '90s, and one of my classmates -- a female MI sergeant -- always reacted with shock and disgust whenever we combat arms types behaved, well, like combat arms soldiers do. "That's not politically correct!" she would protest, to the derision of we "real" soldiers. I told her one time that the day political correctness became mandatory in the Army would be the day I got out. That day came in 1996. Discharge, that is...political correctness had already destroyed the Army.
Scouts Out! Cavalry Ho!