The United States Court of Appeals yesterday unanimously upheld the conviction of John J. Pyne, 53, of 10458 Claremont av., former Chicago policeman, and Robert F. Schwartz, 27, of In extortion.’ N. J., on charges of They had been convicted in federal District court last year on and sentenced to five years in prison for extorting $10,000 from a a Utah contractor they falsely accused of being a homosexual. Pyne allegedly headed an extortion ring. A third defendant, Edmund Pasewicz, 45, pleaded guilty and is serving a prison term of four years.