This bit in the Gospel of Matthew:
19While Pilate was sitting on the judge’s seat, his wife sent him this message: “Don’t have anything to do with that innocent man, for I have suffered a great deal today in a dream because of him.”
20But the chief priests and the elders persuaded the crowd to ask for Barabbas and to have Jesus executed.
21“Which of the two do you want me to release to you?” asked the governor.
“Barabbas,” they answered.
22“What shall I do, then, with Jesus who is called the Messiah?” Pilate asked.
They all answered, “Crucify him!”
23“Why? What crime has he committed?” asked Pilate.
But they shouted all the louder, “Crucify him!”
24When Pilate saw that he was getting nowhere, but that instead an uproar was starting, he took water and washed his hands in front of the crowd. “I am innocent of this man’s blood,” he said. “It is your responsibility!”
25All the people answered, “His blood is on us and on our children!”
It was clearly the Romans who executed Jesus but the authors of the Gospels thought it wiser for the blame to fall elsewhere than rabble-rouse against the Romans which would have been dangerous. The Jews get the blame, and the Catholic Church only officially apologised in 1965 for blaming Jews in general rather than specific Jewish leaders at the time.
Anti-semitism at the moment generally takes a different form - conspiracy theories. There is a widespread and persistent belief that Jews secretly control the world. There was a fake document published over 100 years ago called The Protocols of the Elders of Zion that was supposed to show this.
There are lots of ways of referencing this conspiracy theory without specifically mentioning Jews. Rothschilds is an old favourite, George Soros is another. Recently there have been plenty of accusations of a shadowy ‘Israel Lobby’ funding and manipulating British politics. Same old, same old. Watch out, also, for people using the word ‘Zionist’ for people controlling politics, the media etc.