Aleksandr Ivanovich Langfang (Russian: Александр Иванович Лангфанг) (1907–1990) was a Soviet torturer, security officer and Lieutenant-General in the NKVD.
He rose through the ranks and by 1937 was the assistant to the head of the 9th section of the 3rd department (counterintelligence) of the NKVD.
He was given responsibility for the investigation of Bolshevik luminaries, such as Nikolay Krestinsky,Osip Piatnitsky, Vilhelm Knorin, Boris Melnikov, and on a special mission Jaan Anvelt as well as many other less notable prisoners.
On June 15, 1946, he attempted to commit suicide by shooting himself in the heart but survived and returned to work for the MGB, attaining the rank of general.
He was found guilty of killing Jaan Anvelt while interrogating him on 11 December 1937[2][3] and sentenced to 15 years of imprisonment under Art.