Frieden
From Halopedia, the Halo wiki
In 2160, before the formation of the UNSC, the Frieden, a resurgent fascist movement springing from anti-Koslovic sentiment in the Jovian Moons was formed to achieve peace by destroying the "oppressors on Terra Firma" and it attacked the U.N. Colonial Advisors on Io, sparking the Jovian Moons Campaign, the Rain Forest Wars, a series of clashes of Mars, and the Interplanetary War. Both the Frieden and the Koslovics were defeated.[1]