VIDEOS:
Radioactive Silence
From: https://youtu.be/Qe5WT22-AO8
When Enrico Fermi discovered nuclear fission, and the implications were realized, publications went quiet about atomic science so Germany wouldn't get any ideas. However, the Soviet Union managed to spot something fishy in the hushing up.
Example of:
Revealing Cover-Up
Example of:
Revealing Cover-Up