State Farm Insurance Cos. is suing Mississippi’s attorney general for allegedly violating an agreement to end a criminal investigation of the insurer’s handling of claims on the Gulf Coast after Hurricane Katrina, according to court papers unsealed last week. State Farm’s lawsuit claims Jim Hood reopened a criminal probe of the Bloomington, Ill.-based company and its employees "for the purpose of harassment’’ and to coerce the insurer into settling civil litigation spawned by the Aug. 29, 2005, hurricane.