A federal prosecutor may file a racketeering lawsuit against a Roman Catholic diocese where a state grand jury found two former bishops helped cover up the sexual abuse of hundreds of children by more than 50 clergy over a 40-year period. The ongoing investigation of the Altoona-Johnstown Diocese grew out of the prosecution of the Rev. Joseph Maurizio Jr., U.S. Attorney David Hickton said Friday, [and] concerns whether diocesan officials engaged in a pattern of criminal activity that would fall under the Racketeer Influenced and Corrupt Organizations Act, commonly referred to as RICO. Hickton's comments came on the heels of a grand jury report released last month by state Attorney General Kathleen Kane. That grand jury was especially critical of Bishops James Hogan and Joseph Adamec. The grand jury found Hogan, in particular, held sway over police and prosecutors in the diocese and often reassigned priests accused of molesting children instead of removing them from duty. Adamec threatened accusers with excommunication and generally worked harder to hide or settle abuse allegations than to discipline the priests accused. Kane's report grew out of allegations that a Franciscan friar ... molested dozens of students at a school in the diocese from 1992 to 2000.