After federal officials starting investigating charges of insider trading, four hedge-fund employees apparently worried they might be next. They were right. U.S. attorneys in Manhattan announced charges against the four, who are accused of insider trading and obstruction of justice. The FBI says Samir Barai and Donald Longeuil frantically began shredding documents, deleting emails, and putting data files on encrypted drives after word of an investigation leaked in November 2010. “[S]hred as much as you can,” one wrote. The four new suspects join eight employees or consultants at Primary Global Research who were previously indicted on charges of sharing nonpublic information.