Bulgakov first attracted the attention of the OGPU in 1922. On 7th May 1926, Bulgakov’s flat was searched and the writer’s manuscript of Heart of a Dog and personal diaries were confiscated. Bulgakov was called to be interrogated at Lyubanka on numerous occasions (the emigrant publication Days even reported on this in 1927), he wrote a number of applications to demand the return of his confiscated possessions and asked Gorky for help. In 1929, they did return the manuscript of Heart of a Dog to him. As for what happened to the diaries, there are two versions - according to one, the diaries simply remained at Lyubyanka, but the other, as told by Bulgakov’s third wife, Elena Sergeevna, has that Bulgakov was returned the diaries and destroyed them himself, keeping only a few pages.