During the war and just after. [fact]
During the war and just after, in 1944, 1945, and 1946, Meyer, hired by the Office of Scientific Research and Development to develop a dependable plague vaccine, injected bacteria into hundreds of inmates at San Quentin prison, after the prison’s warden, Clinton Duffy, put out a call for “human guinea pigs.”
Nicholson Baker, Baseless- My Search for Sec…, loc. 201