The Boston police strike ended after four days of rule by the state militia, the deaths of nine people, and accusations that striking officers were "agents of Lenin".

The Boston police strike occurred on September 9, 1919, when Boston police officers went on strike seeking recognition for their trade union and improvements in wages and working conditions. Police Commissioner Edwin Upton Curtis denied that police officers had any right to form a union, much less one affiliated with a larger organization like the American Federation of Labor (AFL), which some attribute to concerns that unionized police would not protect the interest of city officials and business leaders. Attempts at reconciliation between the Commissioner and the police officers, particularly on the part of Boston's mayor, Andrew James Peters, failed.

Vladimir Ilyich Ulyanov, better known as Vladimir Lenin, was a Russian revolutionary, politician and political theorist. He was the first head of government of Soviet Russia from 1917 until his death in 1924, and of the Soviet Union from 1922 until his death. As the founder and leader of the Bolsheviks, Lenin led the October Revolution which established the world's first socialist state. His government won the Russian Civil War and created a one-party state under the Communist Party. Ideologically a Marxist, his developments to the ideology are called Leninism.