Final answer:
The Lenin organization similar to Tsar's Okhrana was the Cheka, the Bolshevik secret police established in 1917 to combat counter-revolution and sabotage.
Step-by-step explanation:
The organization from Lenin's era that was similar to the Tsar's Okhrana was the Cheka. Established by Lenin in 1917, the Cheka was the Bolshevik secret police, officially known as the Extraordinary Commission for Combating Counter-Revolution and Sabotage. Under the leadership of Feliks Dzerzhinskii, the Cheka was responsible for quashing any resistance through ruthless means, much like the Okhrana which was the secret police force of the Tsarist regime. Both organizations engaged in espionage, secret investigations, and ruthless suppression of opposition to the government.