The Simon Wiesenthal Center complained on Saturday to Croatia's state television channel regarding its broadcast of a singer known for expressing nostalgia for Ustasha, Croatia's pro-Nazi ruling party during World War II.

The singer, Marko Perkovic, who is also known as "Thompson," is one of the most popular rock stars in Croatia. One of his songs is named after the Jasenovac concentration camp, where Croatian forces killed 90,000 Jews, Serbs and Gypsies.

The Croatian network, Channel 2, aired on Saturday a Perkovic concert, held two weeks ago and attended by some 60,000 spectators. Many of the fans were shown sporting Ustasha symbols and uniforms.

Dr. Efraim Zuroff, director of the Wiesenthal Center in Israel, said that the decision by the state television channel to air the concert was an expression of support for Croatia's past crimes.

'The widespread display of Ustasha and ultranationlist symbols at Thompson concerts is no mistake or coincidence. A singer who sings nostalgically about Ustasha leader Ante Pavelic and favorably about Croatia's worst World War II concentration camps Jasenovac and Stara Gradiska, is openly urging his fans to identify with the genocidal Ustasha regime which sought to liquidate Croatia's Serbs, Jews, and Gypsies as well as their Croatian political opponents," says a statement issued by the Wiesenthal Center.

"By broadcasting Thompson's concert on state television in prime time the government is in essence expressing its approval for his hateful message," the statement concludes.

haaretz.com