The government kicked off the Wedtech racketeering trial today by accusing Rep. Mario Biaggi and his six co-defendants of theft from the defunct Bronx defense contractor. ``This is a case about corruption and greed,'' Howard Wilson, an assistant U.S. attorney, told the 12-person jury in U.S. District Court. ``It is a case about public officials who want to get paid twice.'' Wilson pointed to Biaggi and former Bronx Borough President Stanley Simon at the defense table and said they and the others stole from Wedtech. Some had been promised more money, he said. At the trial's opening, Judge Constance Baker Motley told the jury: ``An indictment is simply a series of charges. ... A defendant on trial is presumed innocent and this presumption of innocence is presumed throughout the trial.'' The case involving the defense contractor includes charges that the seven defendants looted millions of dollars in cash and stocks from the company. The trial is expected to last several months. In addition to Biaggi, 70, and Simon, 57, the defendants are: Bernard G. Ehrlich, 59, Biaggi's former law partner and a former major general in the New York National Guard; Biaggi's eldest son, Richard, 38; Peter Neglia, 39, the former regional administrator of the Small Business Administration; former Wedtech chairman John Mariotta, 57; and Ronald Betso, 39, a former city police officer and close friend of Neglia's. They are charged with racketeering and conspiracy, which each carry maximum 20-year penalties upon conviction, as well as various other alleged crimes. Biaggi is also accused of extortion, bribe-receiving, wire fraud, perjury and filing false tax returns.