In e.g. Sweden, the communists stooped being Stalinists when Moscow told them that Stalin was bad... They did start to critizise the Eastern block dictators early... about 1990!
(There were also anarchists etc, but in general the non-communist extreme left-wingers were few before ~1968, when they got more numerous and varied).
Also, I remember reading surprise after 1989 on how much control Soviet had over the West European communist parties. E.g. that the Italian communist party had such an accomodating attitude by order (Soviet wanted to get a de facto split in Western/Eastern Europe.)
I don't know about anywhere else but in the UK there was a very large "socialist" party in Labour and tiny "communist" parties that never really had much power.
I guess it depends what you mean by "socialist" - Labour created the NHS and nationalised some of the key heavy industries of the time (coal, steel, electricity):
Turns out that the NHS was a good idea and the nationalising of industries was a bad idea!
Of course, when Labour re-invented itself in the 1990s as "New Labour" they pretty much became "Conservative-Lite" - I'm still not sure what values they actually have.
For once, the Swedish politics is more interesting! Well, at least if you enjoy sick humor.
The Swedish (ex-)communists became feminists and anti-racists (they argue for something called "structural racism" that native Swedes are guilty of to immigrants -- never with references to non-extremist sources).
In short, just the normal marxism, but another group than "workers" to create conflicts around.
This wouldn't be more than a detail, but the left wing extremists has a big, big representation in the journalist profession since the early 70s. You find lots of left wing academics saying weird stuff in the media, without being identified as e.g. extremist ex-mental patients (Hübinette) or anarchists which wrote admiringly about Ghadaffi (Gardell), etc.
(There were also anarchists etc, but in general the non-communist extreme left-wingers were few before ~1968, when they got more numerous and varied).
Also, I remember reading surprise after 1989 on how much control Soviet had over the West European communist parties. E.g. that the Italian communist party had such an accomodating attitude by order (Soviet wanted to get a de facto split in Western/Eastern Europe.)