Πείραμα με το νευροπαραλητικο αέριο Sarin.

U.S. Honest John missile warhead cutaway, showing M134 Sarin bomblets (c. 1960)

US used more than 200 tones of this gaz during its war in Vietnam in the 70s.
Syrian rebels backed by the NATO guys used it against Syrian civilians in 2013. 
Hitler used to gaz jewish people with it in the 40s. 
Italians used it during the Italian Libyan war in the 30s.