The New Left was a very deliberate shunning (Hegelian antithesis) of the Old Left. In particular, jettisoning workers' interests and a materialist conception of not just history but reality itself. (This runs the gamut from New Agers to GMO truthers.) The beef is pretty old, but I can understand why far-left on far-left crime can be new and strange to those outside the tree house.
As I intimated, the Old Left is going through something of a Hegelian synthesis at present given decades of New Left stagnancy, but whether that amounts to anything in the end is a mystery.
I don't officially belong to any groups, Himu, but the West's M-L party (the PSL) is a less salon, more organizational example of what I was talking about.