Second Foundation
Indeed, the Second Foundation still does exist, but rather than being in complete control, as the First Foundation fears, it has similar worries. On Trantor, home of the Second Foundation, Stor Gendibal, a rising intellect in the Second Foundation hierarchy, reveals to Quindor Shandess, the current First Speaker, his finding that the Seldon Plan, which the Second Foundation diligently protects and furthers along, is being manipulated by some unknown group, probably more powerful than the Second Foundation, with unknown motivations. Shandess dubs this group the "Anti-Mules," as they seem to possess powers similar to the Mule, but to be using them not to destroy the Seldon Plan, as the Mule had tried to do, but rather to preserve it.