Would that be American liberals (I’m very sorry to say) or the liberals of Western Europe?
Either answer or “both” would work for me. Unfortunately.
I had people such as Marx, Engels, Bismarck et al in mind.
The last on that list implemented something called “state socialism”, which we know today as the European Union’s “social market economy” (someone called Adolf used the former term).
Never mind the societal ideas related to family, private property, religion etc.