Former New Orleans Mayor Ray Nagin has been indicted by a grand jury on 21 federal corruption counts. The 25-page indictment that came down Friday included charges of conspiracy, money laundering and wire fraud. Nagin, 56, has been issued a summons to appear in court. Nagin’s sons Jeremy Nagin and Jarin Nagin were not indicted but still face exposure, as does his wife Seletha Nagin because of his the charge involving false tax returns. "This is a sad day for the city of New Orleans," current Mayor Mitch Landrieu said in a news release. "Today’s indictment of former Mayor Ray Nagin alleges serious violations of the public’s trust. Public corruption cannot and will not be tolerated.” The case has been assigned…