The Flying Squad is a branch of the Serious and Organised Crime Command within London's Metropolitan Police Service. It is also known as the Robbery Squad, Specialist Crime Directorate 7, SC&O7 and SO7. It is nicknamed The Sweeney, an abbreviation of the Cockney rhyming slang "Sweeney Todd".

Sweeney Todd is a fictional character who first appeared as the villain of the penny dreadful serial The String of Pearls (1846–1847). The original tale became a feature of 19th-century melodrama and London legend. A barber from Fleet Street, Todd murders his customers with a straight razor and gives their corpses to Mrs. Lovett, his partner in crime, who bakes their flesh into meat pies. The tale has been retold many times since in various media.