Says here that Laurence was the only journalist to witness Trinity AND Nagasaki.
http://research.omicsgroup.org/index.php/William_L._Laurence
I'm not surprised some leftie reporter tried to get his Pulitzer revoked years later.
Apparently, he published an article denying that the black rain carried radiation, reasoning the radioactive cloud had drifted well away. He was wrong, but scientists knew next to nothing about radiation or radiation sickness at the time. I remember in something I've read in the last couple of months some in the military thought that if the strategic atomic bombing did not produce a surrender, future bombs should be used as tactical nukes on Kyushu, dropping 2 or 3 days before our troops would hit the beaches in Operation Olympic. That is how ignorant we were before the issue was studied in depth after the end of the war. Shoot, in 1953 my father in law was one of the soldiers shipped to Nevada to observe the firing of the Atomic Cannon with no protection. In later years he was sure he was exposed to more radiation than he should have, but fortunately he didn't develop sickness or ever have cancer.