; Shelton v. Tucker, 364 U.S. 479 (1960); Bates v. Little Rock, 361 U.S. 516 (1960); Healy v. James, 408 U.S. 169 (1972); Elrod v. Burns, 427 U.S. 347 (1976); Roberts v. United States Jaycees, 468 U.S. 609, 622 (1984); Boy Scouts of America v. Dale, 530 U.S. 640 (2000)