WASHINGTON — A former municipal derivatives trading desk manager at Banc of America Securities LLC has pleaded guilty to one criminal count of engaging in a conspiracy to falsify bank records in connection with a scheme to rig bids and pay kickbacks for investment agreements and other financial contracts in the muni market.

In an “information” document released Wednesday, the Justice Department said Brian Scott Zwerner managed the derivatives trading desk at “Bank A” from around July 1998 to October 2002.

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