Warsaw Pact use of chemical weapons.

[HorseSoldier]

Originally Posted by Trooper

Soviets were ready to use both chemical and biological weapons. They even had ICBM with bio warheads.

Their bioweapons program was some purely terrifying lunacy. If they'd popped the Small Pox and bio-engineered, treatment resistant Plague and whatever else out of the bag the end state would probably be population density drifting below the level where the direction in the 21st century was back into living in caves and chipping flint rather than getting industrial society built back up.