Former Kohn, Swift & Graf partners Michael J. Boni and Joanne Zack have opened Boni & Zack, a class action firm specializing in antitrust, consumer protection and copyright law.

Boni, who had been with Kohn Swift for 14 years, brought two associates to the startup, Kate Reznick and Joshua D. Snyder. Zack, with Kohn Swift for 18 years, had retired and is now returning to practice.