WASHINGTON — The Justice Department on Thursday filed a six-count indictment against three former UBS bankers — Peter Ghavami, Gary Heinz and Michael Welty — for participating in fraud schemes and conspiracies in connection with the bidding on contracts for municipal bonds from 2001 until 2006.

Heinz was also charged with witness tampering. After he learned of the Justice antitrust probe of the muni market in November 2006, he allegedly told another individual to meet with a second person to coordinate stories about a rigged deal, the department said.

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