The founder of the American extremist group Goyim Defense League says he was arrested in Poland this week after demonstrating in front of the Auschwitz-Birkenau former extermination and concentration camp. Jon Minadeo Jr. posted about his arrest on Gab, the social media platform favored by right-wing extremists barred from other platforms, on Sunday, Sept. 4. He said he had been charged with “(((Hate Speech))) regarding Aushwitz,” using a parenthetical notation adopted by neo-Nazis to identify Jews online and misspelling the Nazi concentration camp in which more than 1 million people were murdered during the Holocaust. The Polish national police did...