Loyalists

In Call of Duty 4: Modern Warfare
The Loyalists are the military who remain loyal to the established Russian Federal government. This term is often used to distinguish between two military forces of the same nationality, particularly during a civil war or revolution in a nation. The Russian Loyalists who are fighting Ultranationalists, a paramilitary force in opposition to the established government of the Russian Federation under the control of President Kroputkin.