Passage: The robbery featured in headlines worldwide: "Rain of Bombs: Revolutionaries Hurl Destruction among Large Crowds of People" in the London Daily Mirror, "Tiflis Bomb Outrage" in The Times of London, "Catastrophe!" in Le Temps in Paris, and "Bomb Kills Many; $170,000 Captured" in The New York Times.Authorities mobilized the army, closed roads, and surrounded the square hoping to secure the money and capture the criminals. A special detective unit was brought in to lead the police investigation.  Unfortunately for the investigators, witness testimony was confusing and conflicting, and the authorities did not know which group was responsible for the robbery. Polish socialists, Armenians, anarchists, Socialist-Revolutionaries, and even the Russian State itself were blamed.According to Brackman, several days after the robbery the Okhrana agent Mukhtarov questioned Stalin in a secret apartment. The agents had heard rumors that Stalin had been seen watching passively during the robbery. Mukhtarov asked Stalin why he had not informed them about it, and Stalin stated that he had provided adequate information to the authorities to prevent the theft. The questioning escalated into a heated argument; Mukhtarov hit Stalin in the face and had to be restrained by other Okhrana officers. After this incident, Mukhtarov was suspended from the Okhrana, and Stalin was ordered to leave Tiflis and go to Baku to await a decision in the case. Stalin left Baku with 20,000 rubles in stolen money in July 1907. While Brackman claims to have found evidence of this incident, whether Stalin cooperated with the Okhrana during his early life has been a subject of debate among historians for many decades and has yet to be resolved.

Question: who felt they knew about two people working together?
Brackman