When last we considered the quandary that is cosmic balance in the DC multiverse, we had established from expository dialogue by the Spectre that worlds may eventually collide if there is a migration of individuals from one universe into another without a compensatory trade. Or in layman's English, you can get anything of value if you don't give something.
We considered how in All-Star Squadron #31-36, the first chronological encounter between two parallel Earths, five soon-to-be deceased Freedom Fighters as well as Uncle Sam, the Ray and Black Condor of Earth-Two traded places with several living and/or dead (unsure which from issues 31-32) Earth-X Nazi troopers. The excess of Nazi's would soon be countered by the Blackhawk Squadron which followed Sam to Earth-X to protect that world's freedom... or rather attempt to. The Fighter's record wasn't quite as sterling on their adopted world a universe away.
Among the first casualties of Sam's migrant meta-humans to the hero-less Earth-X was Red Bee. Rick Raleigh decided to take his fight from the comfy District Attorney chair he had to the streets. Accompanied by his trained bees, he set up quite a sting (ahem) operation as the Red Bee on west coast crime. The Bee proved little more than a temporary delay for Baron Blitzkrieg. Then Uncle Sam avenged the murder of the scarlet stinger upon the Baron.