Clarification: I don't mean people who think and act like Commies. I know there are plenty of those. I mean real honest-to-Stalin "card carrying members" of an outfit with historical continuity to the old Comintern.
There are plenty of “real” commies left. They holed up in Academia and the media. They are now convinced they’ve reached some kind of societal tipping point where they can come out of hiding and start using the old vocabulary again. Yes some of them have the actual “card” - as in being associated with CPUSA.
Open borders is nothing more or less than them trying to foment the final revolution.