International Magic Circle
International Magic Circle was form in the 1930s by Blackstone (who was president) and Walter Gibson (who edited their official Journal, Seven Circles as competition to the IBM and SAM. Howard Thurston, T Nelson Downs, the Great Raymond, Dorny, Dr Tarbell, and Len Vintus all served various times as vice presidents.
It only lasted a few years.
- See Also: the British Magic Circle