John J. Pyne, 52, of 10458: Claremont Ave was ordered by federal District court Judge Richard B. Austin yesterday to appear today in New York City to be arraigned on federal charges of extortion. Pyne, a Chicago policeman on sick leave since 1963, was arrested at his home June 24, by federal bureau of investigation agents on a warrant issued by federal District court in New York City. Pyne and four others are accused of posing as police to shakedown persons on sex charges. Federal officials said the men would lure wealthy business men, entertainers, homosexuals, and others into sex traps and then demand money for secrecy..