The Siege of Sidney Street of January 1911 was a gunfight in the East End between a combined police and army force and two revolutionaries.
The siege was the culmination of a series of events that began in December 1910, with an attempted jewellery robbery at Houndsditch which resulted in the murder of three policemen, the wounding of two others, and the death of George Gardstein, the leader of a Latvian gang.