A Chicago police sergeant who allegedly was sexually harassed by her former supervisor has filed a federal lawsuit against the city — seeking class status to represent scores of Chicago Police Department officers — alleging CPD’s internal affairs improperly pauses investigations when the same allegations are raised in litigation or to outside oversight agencies.

The lawsuit in Chicago’s federal court was filed by CPD Sgt. Carrie Costanzo, who joined the department in 2015.

“Costanzo’s story is but one example of the significant harm that the City’s unlawful policy imposes on its brave police officers who dare exercise their rights,” the lawsuit states. “Costanzo and the class she seeks to represent bring this action to reform the policy to ensure that what happened to (Costanzo) does not

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