Crimes against humanity.
There’s one fitting punishment for that.
The Biological Weapons Anti-Terrorism Act of 1989 states:16
“Whoever knowingly develops, produces, stockpiles, transfers, acquires, retains, or possesses any biological agent, toxin, or delivery system for use as a weapon, or knowingly assists a foreign state or any organization to do so, shall be fined under this title or imprisoned for life or any term of years, or both.”