Six of which birds were brought inside at the Tower of London in 2006 to guard against bird flu?

Which six-letter word means mirthless, sober or grave? Six members of which radical group that kidnapped Patty Hearst died in a fiery shootout in May 1974? Six of Bugs Moran's henchmen and an optometrist were the victims of which 1929 slaughter in Chicago? Weeks after his death in May 1998, which singer had six albums on Billboard's Top Pop Catalog chart? What is worth six points on the football field? Six teammates, a center line, a blue line and a crease belong to which sport? Raquel Welch wore a famous fur bikini in which 1966 film? Six years after her 1957 Wimbledon win, which tennis great turned pro golfer?