communism is solely a Jewish Effort.
Not solely, but yes Jews took a big part in forming and upholding the communist regime. Let's forget about bias and focus on the numbers.
In Stalinist Poland (1948-53), around 37% of communist Ministry of Public Security (UB) were Jewish, 50% were Polish and the rest were Soviet.
But there's a catch: we are talking about post-war Poland where Jews stood for ~1% of the total population. That's a huge overrepresentation of Jews in the UB don't you think?
Those are facts, not antisemitism. Unless we define "antisemitism" as: discussing historical facts which modern Jewish organizations would not like to hear about.
Jews in Poland were both: the victims of the German army during WWII and the oppressors of Polish population after WWII. And then again the victims of a repression within the communist party after the end of the Stalinist era, like Zygmunt Bauman* or Stefan Michnik*. That doesn't make them good people, thought.
You don't have to reach to "conspiracy thereories" to check some of those facts nad numbers. Because of the nature of the subject there are not many English sources but even a generally left-leaning Wikipedia articles share some of those figures.
Wiki has provided its own, more politically correct, narrative but some numbers are solid.