Who are the moles? The question was like a parlor game for employees of State Farm Insurance Co. after Hurricane Katrina, one they nervously played during coffee breaks or in the parking lot after work. Richard "Dickie" Scruggs, a prominent lawyer of tobacco litigation fame, created a stir by announcing in March that two "insiders" were helping him build cases against insurers for denying claims for Hurricane Katrina losses. Their identities remained a mystery until the day in early June when Cori and Kerri Rigsby — employees of a company that contracted with State Farm — told a supervisor they...