Intergalactic treaty
The intergalactic treaty was a treaty mentioned in a message sent to the  in 2268. 

When Bele, the High Chief of the Commission on Political Traitors for Cheron, requested that the Enterprise transport him with his prisoner Lokai to their homeworld, Starfleet Command replied with a message stating that extradition without due process for any being was specifically not allowed by the intergalactic treaty. ()
Treaties
Federation