Nikolai Ivanovich Bukharin (October 9, 1888 – March 15, 1938)
Bukharin did not play a significant role in the Bolshevik seizure of power.
After the revolution, he became editor of Pravda.

After 1926, Bukharin, by then regarded as the leader of the Communist Party's
right wing, became an ally of the center of the party, which was led by Stalin and
which constituted the ruling group after Stalin broke his earlier alliance with
Kamenev and Zinoviev. It was Bukharin who detailed the thesis of "Socialism
in one country" put forth by Stalin in 1924, which argued that socialism
(in Leninist theory, the transitional stage from capitalism to communism)
could be developed in a single country, even one as underdeveloped as Russia.
This new theory stated that revolution need no longer be encouraged in the
capitalist countries, since Russia could and should achieve socialism alone.
The thesis would become a hallmark of Stalinism.

Bukharin was politically rehabilitated by Stalin and was made editor of Izvestia
in 1934, where he consistently highlighted the dangers of Fascist regimes
in Europe. He was arrested following a plenum of the Central Committee
in 1937 for conspiring to overthrow the Soviet state. He was tried in
March 1938 as part of the Trial of the Twenty One during the Great Purges,
and was executed by the NKVD, on March 15th 1938.