(1) David Shub was a member of the Social Democratic Labour Party who suspected that Roman Malinovsky was a spy.

There was a wave of arrests among the Bolsheviks in Moscow. Among those rounded up was Nikolai Bukharin. Bukharin, then a member of the Moscow Committee of the Bolshevik Party, had distrusted Malinovsky from the start, despite the latter's assiduous attempts to win his confidence. For Bukharin had noticed several times that when he arranged a secret rendezvous with a party comrade, Okhrana agents would be waiting to pounce on him. In each case Malinovsky had known of the appointments and the men whom Bukharin was to meet had been arrested.

(2) When Vladimir Lenin saw the evidence he admitted that Roman Malinovsky had been a spy.

Malinovsky could and did destroy a number of individuals. But as for the growth of the Party in the sense of increasing its importance and influence on the people by the tens and hundreds of thousands, that growth could not be stopped, controlled, or directed by Malinovsky.

(3) A Badayev was a Bolshevik deputy in the Duma. He wrote about the Roman Malinovsky case in his book, Bolsheviks in the Duma (1929)

Malinovsky's life was a series of crimes, his talents, his mind, and his will being used for one purpose: to sell himself at the highest possible price where he could do the most possible harm to the liberation of the working class. He will go down in history as one of its greatest traitors.

(4) During his trial Roman Malinovsky attempted to explain why he spied on the Bolsheviks.

Judge: Why did you accept the 6,000 rubles compensation? You were evidently more interested in the money than in your so-called tragedy.

Malinovsky: If I refused to accept the money the Okhrana would have suspected me of playing a double game. I had to show that I was faithful.

Judge: But you had already proved that by delivering our best comrades to the police.