Carlos M. Diaz of Staten Island, the back-office manager for a brokerage house, said he had voted for the Mayor twice but considered the campaign against vendors to be ridiculous.

He said N.A.S.D. representatives had repeatedly explained the new market to lawyers, traders and back-office managers at institutions and Wall Street houses, and had still walked away without contracts.

In October 1994, Lugo arranged a meeting with Doorbal, his workout partner, Stevenson Pierre, Sun Gym's back-office manager, and a friend of Pierre's called Carl Weekes.

Without admitting or denying the allegations, Salomon consented to the exchange's findings that program trades executed in 1987 on behalf of six customers were altered by a back-office manager causing $1.3 million to be diverted from the customers and to the firm's own account.

Magic Capital, a $25 million hedge fund that did its futures trading and kept virtually all its capital at MF Global, decided three days before the bankruptcy to pull its money out, said Jennifer Yu, a back-office manager at the Rockville, Maryland-based firm.