1. Blackhawk, Stanislaus, Andre, Olaf, Chop-Chop, Hendrickson, and _______?
Chuck. Actually Chuck was originally the American of the group, as Blackhawk himself was Polish in the early stories (although that eventually changed).
2. What was the real name of Lady Blackhawk? What villainess did she become for several years during the 1960s?
The real name of Lady Blackhawk was Zinda Blake; she currently is featured in Birds of Prey. She became Queen Killer Shark for a number of issues in the 1960s.
3. Name the villain:
4. What kind of bird was Blackhawk's mascot, Blackie?
This was supposed to be the trick question, because my impression had always been that he was a raven or a blackbird, but it turns out he is indeed a black hawk:
5. Name the villain:
King Condor had several appearances in the Silver Age; he used mechanical birds to help him with his robberies.
Michael Rebain got the first question, while Michael Sensei got all but #3.