Sidney Reilly, famously known as the Ace of Spies, was a Jewish Russian- or Ukrainian-born adventurer and secret agent employed by Scotland Yard, the British Secret Service Bureau and later the Secret Intelligence Service (SIS). He is alleged to have spied for at least four nations. His notoriety during the 1920s was created in part by his friend, British diplomat and journalist Sir Robert Bruce Lockhart, who sensationalised their thwarted operation to overthrow the Bolshevik government in 1918.

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