You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: LABOR UNION PRESIDENTS 
Clue: This current union president was the youngest person ever to receive a star on the Hollywood Walk of Fame
melissa gilbert

Category: THE SPACE PROGRAM 
Clue: In 1979 NASA officials received a fine for littering from a small town in this country
australia

Category: GOLF 
Clue: It's the only one of golf's 4 major pro events in which amateurs are not permitted to play

the pga championship