It's actually especially focused on Khrushchev, who was the one who sent tanks into Hungary which is where the term originates. It's notable that it focuses on him rather than Stalin, because the real point of the term was to guard against people who might be more sympathetic towards the USSR after "destalinization." The literal meaning may be, "people who support socialist countries no matter what they do," but the actual meaning has always been more like, "people who support anything any socialist country has ever done."