The Combat Organization (Russian: Боевая Организация, romanized: Boyevaya Organizatsiya, or the Fighting Organization) was the terrorist branch within the Socialist Revolutionary Party of Russia. It was a terror sub-group that was given autonomy under that Party. In his memoirs, group member Boris Savinkov called the group the "Terrorist Brigade."^[1] (This phrasing was followed in his own memoirs by Whittaker Chambers, an American spy for the Soviets.^[2])

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Quick Facts Leader, Dates of operation ...

SR Combat Organization
Боевая организация партии социалистов-революционеров
Leader	Grigory Gershuni (1902–1904) Yevno Azef (1904–1908) Boris Savinkov (1908–1911)
Dates of operation	1902 (1902)–1911 (1911)
Country	Russia
Ideology	Revolutionary socialism Left-wing terrorism
Political position	Left-wing
Part of	Socialist Revolutionary Party
Opponents	Russian Empire

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In 1902, Grigory Gershuni founded and led the group. In July 1904 they murdered the Russian Minister of the Interior, Vyacheslav von Plehve.

In 1904, Gershuni was arrested, and Yevno Azef succeeded him, with Boris Savinkov as his deputy. Azef, a double-agent in the employ of the Tsarist secret police Okhrana, changed the Terrorist Brigade's mode of attack from firearms to dynamite. In its middle period (1903–1906) the brigade's members included more than a dozen women and more than four dozen men—some nobles, honorary citizens, priests, and merchants. Most were 20–30 years old; 19 Jews, and two Poles.^[3] In 1908, Savinkov succeeded Azef, but the group disbanded shortly thereafter.

• Grigory Gershuni
• Yevno Azef (also "Evno" and "Azev"/"Azeff" and "Yevno Asiev"^[4])
• Boris Savinkov (also "Savinkoff")
• Mikhail Melnikov
• Stepan Balmashov
• Thomas Kachura
• Igor Sazonov (also "Yegor" or "Egor" and "Sozonov")
• Ivan Kalyayev ("Kaliaev" in the 1931 translation of Savinkov's Memoirs of a Terrorist)
• Sikorsky
• Borishansky
• Dulebov
• Shveitser (also "Schweitser"/"Schweizer")
• Karl Trauberg^[5]

• Socialist Revolutionary Party
• 1905 Russian Revolution
• Terrorism in Russia
• Bolshevik Military Organizations
• PSP Combat organization
• The Just Assassins