For other incidents referred to by this name, see Bloody Sunday.
Bloody Sunday (Russian: Кровавое воскресенье) was an incident on 22 January [O.S. 9 January] 1905 in St. Petersburg, Russia, where unarmed, peaceful demonstrators marching to present a petition to Tsar Nicholas II were gunned down by the Imperial Guard. The event was organized by Father Gapon, who was paid by the Okhrana, the Czarist secret police, and thus considered to be its agent provocateur. Bloody Sunday was a serious blunder on the part of the Okhrana, and an event with grave consequences for the Tsarist regime, as the blatant disregard for ordinary people shown by the massacre undermined support for the state. Despite the consequences of this action, the Tsar was never fully blamed because he was not in the city at the time of protest.

Bloody Sunday
Russian composer Dmitri Shostakovich wrote his Eleventh Symphony as a program composition about Bloody Sunday and the revolution, with the third movement paying homage to the fallen workers gunned down by the Tsarist army.