The New Resistance is a group that was formed after the events of Serenity, due to the controversy that arose after the revelation of the truth about the origins of the Reavers and the experiment on Miranda.
However, it turned out that the resistance was being funded by the Alliance itself, as part of an operation to smoke out and reveal the political dissenters. By the time Bea had found out, the order had already been given to eliminate many of the cells across the 'Verse.