Anti-Semitism is a recurrent problem in the world of soccer. Nowhere else, however, is the origin of wide-spread anti-Semitic chants in stadiums as bizarre as in the Netherlands.

Earlier this month, anti-Semitic slogans were the subject of a court case brought by BAN, an organization fighting anti-Semitism, against ADO. In March, this top league club from The Hague won a game against Ajax from Amsterdam. During the match ADO supporters frequently chanted “Hamas, Hamas, Jews to the Gas” and “Horrible Cancer Jews.”

At a party after ADO’s victory, fans and two players sang in the presence of the trainer, “We are going to chase Jews.” The judge decided that ADO’s management would be held responsible to prevent repetition of similar outbursts at future games and if it could not, management should stop the match.

However, the Jews at whom ADO supporters aimed were not Jews at all. They were the fanatic fans of Ajax who in a distant past had started to refer to themselves as “Jews.” These supporters accompanied their team with Israeli flags and Stars of David to the stadiums. Some fans even had tattoos of the Star of David. There was a time that when Ajax scored a goal, their fans would sing the Israeli song Hava Nagila.