We noticed Soviets suddenly stopped publishing on effects X-Rays on polymeric material. Reason detected flaw in our nuclear warheads
HT: @AtomicAnalyst for clearer actual post test photo!
#Nukespic.twitter.com/5TZkpLi3cl
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To put it another way, it's the difference between self-regulation (which scientists often support) and government regulation (which they don't) of potentially dangerous research.
In the case of the Manhattan Project the secrecy regimes shifted from self-censorship (Szilard) --> control by civilian scientific agencies (Bush) --> control by the military (Groves). Szilard was lukewarm about the second step and hated the third.
What about Bohr? It somewhat seemed like there were some real concerns with him keeping secrets.
Bohr was considered a semi-loose cannon by both the UK and US security folks because of his lack of attention to protocol and procedure, and Bohr explicitly advocated getting rid of all secrecy in the postwar as a means of international control.
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