Conspirators
From Tolkien Gateway
Consisting of Samwise Gamgee, Meriadoc Brandybuck, Peregrin Took, and Fatty Bolger, the Conspirators were friends of Frodo Baggins who discovered that he was making plans to leave the Shire in order to escape some danger related to the Ring and conspired to assist him without his knowledge. Without their preparations, Frodo would likely have been captured by the Black Riders before he even escaped the Shire.