And law was brought into the world for nothing else but to limit the natural liberty of particular men in such manner as they might not hurt, but assist one another, and join together against a common enemy.

Rosesrosabella , it is a natural law.
Mutual Aid: A Factor of Evolution by kniaz Petr Alekseevich Kropo...

Did Kropotkin read anything by Thomas Hobbes?

I can imagine this. Kropotkin was a well-educated man