What did David Bohm do in the making of the atomic bomb?

Answer:
He performed theoretical calculations about things like nuclear scattering.
He was denied a security clearance, which put him in the interesting position of not being allowed access to his own work. (This sort of thing happened occasionally due to the tight security on the Manhattan project... one scientist was head of two separate divisions at the same time, and due to compartmentalization regulations theoretically had to obtain prior approval to talk to himself.)
First answer by Ptorquemada. Last edit by Ptorquemada. Contributor trust: 554 [recommend contributor recommended]. Question popularity: 2 [recommend question].