“The Catholic novelist Walker Percy once said that he thought the survival of the Jews was one of the proofs of God’s existence.”
One of the themes of Percy’s novel “The Thanatos Syndrome” is that anti-Semitism and persecution of the Jews are among the early warning signs of the ascendency of godless totalitarian “utopias”. First the Jews, eventually the Christians and along the way pretty much anybody who believes in freedom and human dignity. Abortion and child abuse as concurrent pathologies are prominent in the novel as well.
That’s one I haven’t read, but it’s on my reading list now.
Jews are not always first to be persecuted.
The French Revolution focused its religious persecution on the Catholic Church, and legally emancipated the Jews.
Bolshevism initially persecuted Christians, especially focusing on the Orthodox Church. At the same time, it made anti-Semitism illegal. It's one of the reason so many Jews outside of the USSR supported the Bolsheviks, and even sent money to support the cause.
Only later, during Stalin's 1930s purge trials, did Soviet Communism begin to turn against its Jewish supporters.
Sometimes the Jews are first to be persecuted. Sometimes not.