Misc: What countrys capital was formed when Pesth and Buda merged?

Questions

What was the name of the gang that were responsible for the St. Valentines Day Massacre?

What was the name of Fred Astaire’s dancing sister?

Who was Myrna Loy’s scree partner in ‘The Thin Man’ movie series?

Who was William Powell’s screen partner in ‘The Thin Man’ movie series?

In 1932, Speed King, Sir Malcolm Campbell broke the 300 mph barrier with his race car. What was the name of his famous racecar?