So left-wing is really better defined, although not perfectly defined, as progressive, eh? I’m aware that these labels mean very little now as related to then, but progressive would certainly be a better fit than liberal. It almost seems that left-wing, back in the FR, was really referring to the poorer classes, who, of course, wanted change as they were predictably being shat upon. Am I reading this right?
Not to mention that the upper bourgeoisie found that they had a lot in common with the lower aristocracy. 
Yes.