As J. Robert Oppenheimer held very left wing views (and was possibly a communist), why did the US Government allow him to work on the Manhattan Project and how did he justify doing so to himself considering his views? : AskHistorians
https://www.reddit.com/r/AskHistorians/comments/108dia7/comment/j41ygj5/J. Robert Oppenheimer - Wikipedia
https://en.wikipedia.org/wiki/J._Robert_OppenheimerJ. Robert Oppenheimer cleared of “black mark” against his name after 68 years | Ars Technica
https://arstechnica.com/science/2022/12/j-robert-oppenheimer-cleared-of-being-suspected-soviet-spy-after-68-years/Why President Harry Truman Didn’t Like J. Robert Oppenheimer
https://www.biography.com/political-figures/a44361438/why-harry-truman-didnt-like-oppenheimer-atomic-bombs