Relief pitcher Hoyt Wilhelm, considered the greatest knuckleballer of all time, and Lou Brock and Enos Slaughter, whose careers were built on speed, will be inducted today into baseball's Hall of Fame in Cooperstown, N.Y.

Also being inducted is the late Arky Vaughan, whose career batting average of .318 is second to Honus Wagner's .329 among Hall of Fame shortstops.

Wilhelm and Brock were selected by the Baseball Writers Association of America, Vaughan and Slaughter by the Hall of Fame Veterans Committee.

In 21 seasons, Wilhelm appeared in a record 1,073 games, winning 143 (123 in relief) and saving 227 before retiring at age 49. He hit his only home run in his first major league at bat with the New York Giants in 1952. He pitched a no-hitter for the Baltimore Orioles against the New York Yankees in 1958.

Brock, who joined the St. Louis Cardinals in 1964 and helped them win pennants in '64, '67 and '68, owns the record for career stolen bases at 938. He retired in 1979, five seasons after he had set what was then the single-season record of 118 stolen bases, surpassed in 1982 by Oakland's Rickey Henderson.

Slaughter retired in 1959, a career .300 hitter over 19 seasons. He hit .291 in five World Series.