Marx was an ethnic jew. But he converted to christianity at a young age and I believe he hated jews/judaism.
Anyways it is true that jews have historically supported left wing movements. This is because of judaism's emphasis on social justice. We believe the world is broken and that we need to fix it. Its a concept called Tikkun Olam. Judaism also doesn't have much of an emphasis on heaven or the afterlife, which is probably a motivation to make our current life better. Jews have also had a heavy influence in academia, which is where left wing movements came from.
That being said, when people like Tejas accuses others of being "naxalites on Soros's payroll", he's essentially invoking the nazi theory of "cultural bolshevism".
https://en.wikipedia.org/wiki/Cultural_Bolshevism
This idea that Soros, a rich jewish man, is a puppetmaster controlling every leftist movement(rather than him simply being an ally to already existing independent leftist movements) for the sake of somehow subverting traditional culture is a page right out of the Nazis' propaganda books.