Milberg Weiss & Bershad has lost the two partners responsible for its antitrust practice. J. Douglas Richards and Michael M. Buchman have joined rival New York class action law firm Pomerantz Haudek Block Grossman & Gross.

The pair are veterans of major antitrust cases over the costs of prescription drugs, Microsoft software and auction house fees. They also participated in the massive case against Mastercard and Visa that produced the largest antitrust settlement in history.