Are we ever going to be rid of the 70's leftists?
Probably not, many of them were the Red Diaper babies of '30s, '40s and '50s Communists from various Groups. ANSWR traces it's lineage directly to a pro Stalin group of the 50s. The group split over the Sovite invasion of Hungary, in 1956) The ANSWR folks were in the group that thought it a great idea.
Many of those '40s and '50s Reds were themselves Red Diaper babies of the American Communists of the 20s and 30s.
I expect the kids of the ANSWR, Code Pink, etc folks will come back and work against their country yet another time.