A federal judge declined to throw out a jail guard’s lawsuit alleging she got flak from her supervisors because a colleague identified her in his bias complaint as a witness.In a written opinion last week, U.S. District Judge Thomas M. Durkin did not rule on the merits of Hazel L. Derden’s allegation that the Cook County Sheriff’s Office targeted her for retaliation in violation of Title VII of the Civil Rights Act of 1964.But Durkin held Derden has stated a claim that her supervisors took materially …