In the context of discourse in American politics -- and increasingly Canadian ones as well -- "left wing" has been rewritten to be almost exclusively about cultural politics. This is the only way one can decode everyday conversations when people talk about "the left"; they clearly don't mean what it meant "classically": socialist politics / economic policy, working class politics.

It's basically a marginal position at this point to be outright pro-union, even more so to be pro-nationalization / pro-interventionist. Apart from outliers like maybe Bernie Sanders, an explicit working class orientation has been taken over almost completely by the populist right, and much of the self-identified "left" speaks mostly to the concerns of the upper middle class. Not just the mainstream of the US Democrats, but even much of what is spoken about by "the squad", or the Canadian NDP party.

Regular working people are not the audience anymore.