"Ring the Damn Bell" offers a nice pictorial review of the Fabulous Freebirds through wrestling history.
Michael Hayes, "Bam Bam" Terry Gordy, and Buddy Roberts were the original three, and Jimmy Garvin was a big part of the history, too. But there were other less memorable members and they are all outlined here in the article "The Not So Fabulous Freebirds Through the Years."
The original Freebirds briefly wrestled for Jim Crockett Promotions in 1984 before leaving to go to the WWF. Their tenures in both places lasted a matter of only weeks.