L. V. Dubbelt

Leontiy Vasilievich Dubbelt () (1792–1862) was a Russian soldier and police chief under Nicholas I. He fought at the Battle of Borodino in 1812 and was briefly suspected of being involved in the Decembrist conspiracy of 1825. He ran the feared Third Section and was directly involved in secret service cases involving writers and intellectuals such as Pushkin, Lermontov, Saltykov-Shchedrin and Turgenev.