Last Tuesday, a group of Holocaust survivors, by now gaunt and frail, made their way back to Auschwitz, the West’s symbol of evil—back to the slave-labor side of the vast complex, with its mocking inscription Arbeit Macht Frei (“Work makes you free”), and back to the death camp, where a million and a quarter human beings, most of them Jews, were gassed, burned and turned to ash. They were there to commemorate the day, 70 years ago, when Soviet troops liberated Auschwitz and saw, for the first time, the true dimensions of the greatest crime since human beings first set foot on Earth.

The moment would have been emotional at the best of times, but this year brought an especially disturbing undercurrent. The Book of Genesis says that, when God told Abraham what would happen to his descendants, a “fear of great darkness” fell over him. Something of that fear haunted the survivors this week, who have witnessed the return of anti-Semitism to Europe after 70 years of political leaders constant avowals of “Never again.” As they finished saying Kaddish, the Jewish prayer for mourners, one man cried out, “I don’t want to come here again.” Everyone knew what he meant. For once, the fear was not only about the past but also about the future.

The murder of Jewish shoppers at a Parisian kosher supermarket three weeks ago, after the killing of 12 people at the offices of the satirical magazine Charlie Hebdo, sent shivers down the spines of many Jews, not because it was the first such event but because it has become part of a pattern. In 2014, four were killed at the Jewish Museum in Brussels. In 2012, a rabbi and three young children were murdered at a Jewish school in Toulouse. In 2008 in Mumbai, four terrorists separated themselves from a larger group killing people in the city’s cafes and hotels and made their way to a small Orthodox Jewish center, where they murdered its young rabbi and his pregnant wife after torturing and mutilating them. As the Sunday Times of London reported about the attack, “the terrorists would be told by their handlers in Pakistan that the lives of Jews were worth 50 times those of non-Jews.”

An ancient hatred has been reborn.

Some politicians around the world deny that what is happening in Europe is anti-Semitism. It is, they say, merely a reaction to the actions of the state of Israel, to the continuing conflict with the Palestinians. But the policies of the state of Israel are not made in kosher supermarkets in Paris or in Jewish cultural institutions in Brussels and Mumbai. The targets in these cities were not Israeli. They were Jewish.