Conservative and Republicans have been saying that the Leftist movement is a tool invented by the Jews - something documented even in the Protocols of the Elders of Zion - for ages.
The same for Liberalism, Progressivism... When Jews participated in the Civil Rights Movement back in the 1960s, Conservatives and Republicans pointed their fingers at them as proof that the Civil Rights Movement was actually an incognito Communist ploy. To this day, the term "Globalism" is an open dog whistle referring to Jews trying to spread Communism, a pejorative claiming it is part of an international Zionist plot.
Anti-Semitism that's had a dramatic increase in the last decade, during Trump. But not only in the US, but also throughout Europe wherever Far Reich movements have been taking hold.