Cokinos Young, a midsize construction law firm based in Houston, sued its former marketing director Thursday, alleging she took confidential client contact information when she left the firm and threatened to use client cell phone numbers to “make this a war.”

The law firm, which has 68 lawyers in five offices, is seeking a temporary restraining order to prevent Brittany O’Brien, the former director of client and external relations, from using contact information for clients to either solicit them or spread rumors. The firm is also seeking up to $1 million in damages.