Gaito v. Pennsylvania Board of Probation & Parole , 488 Pa. 397 ( 1980 )
Parratt v. Taylor , 101 S. Ct. 1908 ( 1981 )
Anderson v. Liberty Lobby, Inc. , 106 S. Ct. 2505 ( 1986 )
Wilson v. Seiter , 111 S. Ct. 2321 ( 1991 )