From 1949 to 1989, the former Soviet Union poisoned its citizens by conducting over 400 nuclear tests in and near Kazakhstan. At the time, the locations were incredibly covert.
With little regard for those who would be affected by the radiation, the government never informed people about the harmful effects of exposure, or that tests were even happening at all. Instead of providing medical attention or support, scientists secretly monitored the horrific effects taking place.
The area near the Polygon (the primary nuclear test site) still has one of the highest rates of cancer in the entire world.