As part of a major re-organization of the Red Army, sometime in 1925 or 1926 the RU (then Razvedyvatelnoe Upravlenye) became the Fourth (Intelligence) Directorate of the Red Army Staff, and was thereafter also known simply as the "Fourth Department." Throughout most of the interwar period, the men and women who worked for Red Army Intelligence called it either the Fourth Department, the Intelligence Service, the Razvedupr, or the RU. […] As a result of the re-organization [in 1926], carried out in part to break up Trotsky's hold on the army, the Fourth Department seems to have been placed directly under the control of the State Defense Council (Gosudarstvennaia komissiia oborony, or GKO), the successor of the RVSR. Thereafter its analysis and reports went directly to the GKO and the Politburo, apparently even bypassing the Red Army Staff.[2]