Socialist was understood then as the abolition of private property, and particularly associated with countries such as Cuba, USSR, PRC, DPRK, etc. The government's you mentioned were what they call social democratic governments aka proponents of a welfare state capitalism. People tend to confuse social democracy for democratic socialism. The first being supporters of more public programs within the frame of capitalism, the latter being socialists that use parliamentary reform to achieve socialism. So the people you mentioned and others such as Bernie sanders fall into the social Democrat camp i.e. supporters of a regulated capitalism, people such as Salvador Allende were democratic socialists i.e. supporters of socialism.

Anyways to get back to your question the reason the anti-socialist campaign wouldn't have been an issue is due to the difference between social democrats and democratic socialists. Socialism has been confused in public discourse these days to refer to Scandinavia or other welfare states which still operate under capitalism. Capitalism is a economic system based on markets, private property, and production based on commodity exchange (though different people will claim different definitions these are some particular features that together set it apart from past economic models such as feudal and slave society). Socialism is the abolition of private property, and the ownership of the means of production by the collective.