NKVD Order No. 00439
NKVD Order № 00439, signed by Nikolai Yezhov on July 25, 1937, was the basis for the German operation of the NKVD in 1937–1938. The operation was the first in the series of national operations of the NKVD. The order commanded to arrest citizens of Germany, as well as former German citizens who assumed the Soviet citizenship.