As Americans spent their Black Friday shopping for deals, Los Angeles-based Mitchell Silberberg & Knupp was fighting to fend off a $260 million legal malpractice lawsuit in Miami federal court.

The law firm’s accuser is Michael I. Goldberg, the chairman of Akerman’s fraud and recovery practice. As the receiver for ski resort company Jay Peak Inc. and related businesses, he claims the firm and a New York partner, David Gordon, conspired with a group of Vermont businessmen who were investigated by the U.S. Securities and Exchange Commission and eventually charged with criminal fraud. Goldberg alleges, among other things, that Mitchell Silberberg and Gordon misled state and federal regulators.