https://www.youtube.com/watch?v=en8o6x5vDZ4
My brother sent me the link and I urge you to watch it.
The survivors talk about how the U.S. occupied Japan after the war and banned them from talking about their experience with the atomic bombs and their illnesses, though they were called to periodic medical examinations ---without any treatment--- and when schoolchildren put up memorials in their schools the memorials were taken down and forbidden. These aspects I had no idea about.