Leó Szilárd
A number of notable individuals and organizations have criticized the bombings, many of them characterizing them as [[war crime]]s, [[crimes against humanity]], and/or [[state terrorism]]. Early critics of the bombings were [[Albert Einstein]], [[Eugene Wigner]] and [[Leó Szilárd]], who had together spurred the first bomb research in 1939 with a [[Einstein–Szilárd letter|jointly written letter]] to President Roosevelt.