Yeah, it's kinda wild because it went from a fairly niche term used mostly by British Trotskyists during the mid to late cold war to refer to British Communists who supported the Soviets putting down the Hungarian counter-revolution in 1956 but has now blossomed into first a word for anglosphere liberals to use to describe anyone to the left of Bernie Sanders and then broadly anyone they don't like. I was aware of it from childhood solely because I have leftist family members who were around during the cold war.