Istvan Merchenthaler PHILADELPHIA — A Downingtown man pleaded guilty Monday to four pending indictments charging him with wire fraud, possession of destructive devices, and related offenses according to U.S. Attorney Zane David Memeger. Istvan Merchenthaler, 44, of Downingtown has been in federal custody since Feb. 16, 2013 since his arrest on charges that he had a stockpile of explosives and more...