Germany arrested a Holocaust denier after he was deported from Canada. Ernst Zundel, 65, who had lived in Canada more than 40 years, was flown to Germany on Tuesday. During his stay in Canada, Zundel gained a reputation as one of the world’s foremost Holocaust deniers. He moved to the United States in 2000 but was deported back to Canada in 2003 on a legal technicality. He had been held in a Toronto detention center ever since. The government had asserted that he was a dangerous mentor to many white supremacist and neo-Nazi groups, including some that espouse violence. A federal court ruling last week upheld the view that Zundel was a threat to national security, thus clearing the way for his deportation. Canada’s Jewish community “is breathing a sigh of relief” at seeing Zundel go, said Bernie Farber, chairman of the Canadian Jewish Congress. When Zundel arrived at Frankfurt airport Tuesday night, Canadian security forces handed him over to German police. In his native Germany, Zundel faces outstanding charges of spreading hatred.