There have been a few controversial trades over the years to come back and bite the Atlanta Braves. Some have more weight than others, but that's the nature of trading players. There's always a chance things work out better for one side.
Braves fans are all too familiar with one trade in the 2000s that caused the organization to lose a pitching prospect that would become one of the best in baseball. Atlanta traded for J.D. Drew and sent Jason Marquis, Adam Wainwright, and Ray King to the Cardinals on December 13, 2003.
Marquis and Wainwright were both first-round picks in their respective drafts, so this was a big deal.