Guo Wengui, a Chinese businessman who transformed himself from a Beijing insider into an anti-Communist crusader and ally of the American far right, was sentenced to 30 years in prison on Monday for defrauding investors, including many of his own fervent supporters, of hundreds of millions of dollars. Mr. Guo, who had made a fortune in Beijing as a real estate developer and had forged an alliance with a corrupt intelligence official there, fled China in 2015, settling in a $68 million Manhattan penthouse overlooking Central Park. There, he took…