That's simple from my POV..."Kill"
You phrased it perfectly, as "crime against humanity", you didn't specify this, so I can substitute my worst idea of "crime against humanity" committed by a person, and then it is easy to answer correctly
Example: A real life "Satan" (worst imaginable devilish person) plans to nuke the whole world. He is sick to the core and no cure is possible (has been scientifically established as a fact), and he will continue till he reaches his goal (also a known fact). Now he only nuked New Zealand and is caught. The whole world will be destroyed, starting with the USA first, unless his body is dead
Only 1 right Dharmic punishment is there, and it's easy to know what must be done...kill his body to make sure he can't commit his intended worst crime, killing humanity
* On Dharma: Krishna taught us that "not killing" is wrong when it's your duty to "kill". And in reality you can't kill, you just kill their bodies, the Atma is indestructible. And the world needs Satya (truth) and Dharma (righteousness), hence "killing" in certain instances is the correct action, not killing is the wrong action, and shows ignorance and being a coward
@stvdvRF