Neither Jews nor Muslims said that . Visigothic Spain was divided between a Nicean/ Chalcedonian Christian majority with little power and Vandal and later Visigoth rulers, who followed Arian Christianity. The Vandals were also forefully converting or murdering Jews. Eventually some Visigoths became Nicean/ Chalcedonian Christian, but they were still divided. The Muslim invaders took advantage of the divisions and religious strife to easily conquer the Iberian peninsula. Ashamed that Christian fighting paved the way for conquest, later Christians blamed Jews.
Many Jews abused their power with relish when given the opportunity, such as when they acted as tax collectors for Polish aristocrats. Or as bankers. The Merchant of Venice trope had its real life inspirations.
Jews are allowed limited jobs, which made them targets, and you fantasize that this was power and imagine a motive. Antisemitic delusions make peoples stupid.
True. But decades earlier, Bolshevism attracted a disproportionate number of Jewish leaders, who used their positions within the atheist regimes of Soviet Russia and Hungary to exact bloody revenge upon Christian clergy and nuns, arresting, torturing, and murdering thousands of them.
Incomplete to the point of being false. None were "Jewish". Marx was a formerly Lutheran antisemite who called for the cultural genocide of Jews
These were apostates from Judaism to the antisemitic atheist cult of communism. Thy murdered Rabbis and burned synagogues. Judaism and all Jewish practices were a crime in the USSR. I would note that the Soviets would recreate the Russian Orthodox Church during World War 2, but Judaism was a crime until the last years of the regime. Former Christian Orthodox seminary student turned Bolshevik mass murderer, Joseph Stalin, died while planning his own final solution to the Jewish Question, the mass murder and siberian imprisonment of Jews under pretext of the Doctors' Plot. Fortunately, Hitler's former ally died on Purim 1953.