Neville Roy Singham, the wealthy husband of the founder of the progressive nonprofit Code Pink and benefactor of far-left political causes, is under criminal investigation by a grand jury in the Southern District of New York, according to multiple sources with knowledge of the matter. The investigation began by looking into possible violations of the Foreign Agents Registration Act and has since expanded into a criminal tax probe over whether money was unlawfully funneled through nonprofits he controls and whether he lied on the tax forms for those nonprofits, known as "990s," the sources said. The criminal investigation was first...