Combat Organization

Combat Organization is a name that has been used by several armed political movements in Russia and Poland, including:

The Combat Organization of the Party of Socialist Revolutionaries
The Combat Organization of the Polish Socialist Party
The Bolshevik Military and Battle Organizations
The Jewish Combat Organization, a Jewish partisan group active in Warsaw during WWII
The Combat Terrorist Organization, a Russian neo-Nazi gang
The Battle Organization of Russian Nationalists, another Russian neo-Nazi group
The Combat Organization of Anarcho-Communists, a Russian anarchist organization