The Ralltiir underground was the name given to the local Rebel resistance movement that operated on the planet of Ralltiir. This resistance arose after the Galactic Empire completed its subjugation of the world in 1 BBY. Among the members of this underground resistance were Pharl McQuarrie and Jeroen Webb, both of whom later became members of the formal Alliance to Restore the Republic. Primarily through McQuarrie's actions, the Ralltiir underground played a crucial role in transmitting information about the first Death Star to Princess Leia Organa, which ultimately led to the battle station's demise during the Battle of Yavin.