Arguably the most common kind of socialism in the ‘west’ historically. To go off of what @emizeko said, they were usually utopian socialists, particularly religious and nudist sects in the U.S., there is a whole sect of German utopians that set up around Missouri I think, but there were lots of these groups up south of Seattle, and even (famously) anarchist nudist socialists on the peninsula in Seattle.

They were non-Marxist in that they didn’t subscribe to any variety of Marxist economic or geo-political thinking, and they usually are big on libertarian principles coming first.