Well, Virginia, again it comes down to definitions.
I was thinking of the progressives of the last century, who certainly distinguished themselves as being champions of a lot of bad ideas. Yes, I know, they also favored women's suffrage (not sure about Shaw on that one), so they were on the right side of history there, but their batting average has been WOEFULLY low.
Furthermore, in my little Poeism, I said those who 'worship at the proggy temple,' i.e., the mindless sloganeers who have no idea of what they are doing, like the protesters at Evergreen, etc.
And yes, I am somewhat familiar with the Murray's bell curve, which as far as I know, is based on respectable science. IQ IS partially genetic, as twin studies have shown, but many on the left don't want to hear that, so they shouted Murray down.
And yes, we do need to watch for proto-fascists, but at the moment, I haven't heard of many of them burning down neighborhoods or campus buildings... the left seems to have that market cornered for now.