The MLB Players Association has hired former assistant U.S. Attorney Jeffrey Perconte as assistant general counsel, one of several changes to the union’s legal department in recent months. Perconte will report to MLBPA General Counsel Ian Penny. Penny was named general counsel in June, replacing Dave Prouty, who is continuing to work with the MLBPA as outside counsel. Before joining the MLBPA in 2010, Penny had worked at the NHL Players’ Association for 10 years, including two years as general…