3. US tested chemicals on residents of poor, black St. Louis neighbourhood during 50s In the early 1950s, the US Army set up motorized blowers on top of residential high-rises in low-income, mostly black St. Louisneighborhoods, including areas where as much as 70% of the residents were children under 12.
The government told residents that it wasexperimenting with a smokescreen to protect the city from Russian attacks, but it was actually pumping the air full of hundreds of pounds of finely powdered zinc cadmium sulfide.