Which Mafia underboss became the government's star witness against John Gotti in 1992?

Which film, based on a true story, is about the forming of a Jamaican bobsled team for the 1988 Winter Olympics? Which 1967 western based on an Elmore Leonard novel starred Paul Newman in Arizona around 1880? Which 1939 film, based on a Clifford Odets play, made William Holden a star? Which 1970s film, based on Erich von Däniken's book, proposed that ancient Earth was visited by aliens? Which 2002 film, based on Maori writer Witi Ihimaera's novel, follows a girl's dream of becoming chief of her tribe? In the 1990 U.S. census, which color was also the fifth most common last name? Which 1995 film inspired a TV series starring Annie Potts as an inner-city schoolteacher? Based on the calculations of French mathematician Urbain Le Verrier, Johann Galle discovered which planet in 1846?