Personally, I do prefer to keep a more general perspective in view, regarding the history of political ideas. If we just focus on the accidental socio-historical situation, we may miss the general spectrum. E.g., in the 1970s and '80s, there was actual left-wing terrorism or individuals who played with the idea of a substantial change. However, it has been decades since we did see such things even sparsely in public discourse. (But still, we may reminded ourselves of what a real "left" or leftist action may imply. Social-democrats are still centrists, after all. On the other hand, nowadays even the former vice chancellor and leader of the conservative party is considered "left" by some. If we would subscribe to such an idea, we may lose orientation.)

Yet another historical marker, at the end of WW1 about 15% of the Viennese population was anarchists, some of them living in illegal settlements. (These anarchist settlements were mostly converted to allotment associations, some of them still carrying auspicious names like "Future". The reintegration of those who had already left the common political ground into a more traditional spectrum is a special and generally overlooked treat of the political history of Austria and probably the cause, why communists were rather rare in Austria as compared to the neighboring countries.)