WASHINGTON — Court documents filed in class action and other lawsuits by issuers’ lawyers who were briefed by attorneys at Bank of America — the one firm that is cooperating with the Justice Department’s antitrust probe in return for indemnity from criminal charges — present a disturbing picture of alleged widespread collusion between dozens of firms involved with municipal investment contracts and derivatives.

Relying largely on information from a confidential witness at Bank of America called CW, the lawsuits provide something of a play-by-play primer on routines among certain firms in the reinvestment and derivatives business. The winners of bids for the contracts in the sector were ­determined in advance, traders used verbal cues to rig bids, some firms intentionally submitted losing bids, and several firms received “last looks” that allowed them to compare competing bids and alter their own to win.

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