David Bergstein LawsuitFilm financier David Bergstein sued LA law firms Stroock & Stroock & Lavan and Levene Neale Bender Yoo & Brill today over his former lawyer Susan Tregub switching sides. Seeking at least $100 million in damages, Bergstein alleges the firms gained confidential information about him and his companies from Tregub while she was his in-house attorney. Stroock and Levene Neale represent Aramid Entertainment Fund’s David Molner and other creditors in their bankruptcy cases against Bergstein. “In the course of their representation, Defendants have crossed the line from zealous advocacy from the netherworld of unethical misconduct,” the 51-page complaint says (read the suit here). Stoock partner Daniel Rozansky and Levene Neale partners David Neale, Irving Gross, and Beth Young are also named as defendants. Bergstein, who is represented by Alex Weingarten of LA-based Weingarten Brown, seeks a jury trial.

Bergstein already has a lawsuit going against Tregub as well as Teri Zimon, another one of his former lawyers. The trial against Tregub is scheduled to start next week. The Whole Ten Yards producer alleges that both attorneys provided creditors with confidential data, leaked negative stories about him to the media and encouraged creditors to initiate involuntary bankruptcy proceedings against him.

Today’s complaint comes just over a week after Bergstein filed suit over Disney’s December 2010 sale of Miramax to a group of investors including Colony Capital, Filmyard Holdings, Miramax chairman Richard Nanula, and others. Bergstein claims he is owned 3.3% of the company and $6 million for putting the deal together in the first place.