Mr. Locke is being perfectly honest here. Unlike purveors of right-wing anti-semetism, he differenctiates between Jews and leftists of Jewish descent.
Unlike you, he understands that the communist Jews hated real Jews more than anything and their intellectual decendants are at war with Jews even today. Hence the calls for open immigration in the US and for the destruction of Israel's Jewish nature or existance.
True enough, but I would say that he ignores the earlier influx of the '48ers and the acceptance of Marx's rantings by some among a generation of northeasterners. Marx was a European visitor, so he's right about communism never being a homegrown phenomenon here.
Communism found its most fertile soil in societies ruled by royalty. The royals had been invited by Americans to keep their rule to themselves and Americans had created for their descendants an example which showed communism for the folly it is long before the Europeans who believed Marx's lies immigrated here in large numbers in the period he mentions.
I think he makes some good points.