Sullivan & Cromwell has hit back at the associate who sued the law firm last month for sexual orientation discrimination, filing its own lawsuit accusing former fourth-year Aaron B. Charney of stealing firm documents and violating client confidences.

In a complaint filed last week in Manhattan Supreme Court, the law firm said Charney had used his suit “as the centerpiece of a malicious public relations campaign, the evident purpose of which has been to embarrass and denigrate S&C, and to name S&C’s clients unnecessarily as part of his campaign.”