What was Einstein's letter to Truman warning him against the use of the atomic bomb?

Question

What was this letter called? When was it written? What was Truman's response?

I know about the Einstein/Szilard letter to Roosevelt in 1939, but did Einstein write a letter after that one? My American Studies teacher said he wrote one in early 1945 or so, warning against the use of the bomb.

Answer 1

The guy above me is talking about the letter prior to the war (1939) written to FDR, however, there was another letter given to General Groves prior to the attacks on Hiroshima/Nagasaki that pleaded for a demonstration of force in the Pacific rather than an attack on civilians. Letters to Truman after the war advocated international control of the nukes and to limit the impending arms race, he was rebuffed in light of the anti-Soviet sentiment then flooding the country...

Answer 2

Einstein, an a group of colleagues wrote to FDR warning about the German pursuit of the atomic weapon, not a letter to Truman. Truman inherited the secret of the atomic bomb project with everyone worried about communism taking over. I think Truman went on to make the decision to use the bomb as much to show Russia and China we were a superpower as much as he wanted to show Japan.