Alexander Valterovich "Sasha" Litvinenko (30 August 1962 or 4 December 1962 – 23 November 2006) was a British-naturalised Russian defector and former officer of the Russian Federal Security Service (FSB) who specialised in tackling organized crime. A prominent critic of Russian President Vladimir Putin, he advised British intelligence and coined the term "mafia state".

In November 1998, Litvinenko and several other FSB officers publicly accused their superiors of ordering the assassination of the Russian oligarch Boris Berezovsky. Litvinenko was arrested the following March on charges of exceeding the authority of his position. He was acquitted in November 1999 but re-arrested before the charges were again dismissed in 2000. He fled with his family to London and was granted asylum in the United Kingdom, where he worked as a journalist, writer and consultant for the British intelligence services. During his time in Boston, Lincolnshire, Litvinenko wrote two books, Blowing Up Russia: Terror from Within and Lubyanka Criminal Group, wherein he accused the Russian secret services of staging the Russian apartment bombings in 1999 and other acts of terrorism in an effort to bring Vladimir Putin to power. He also accused Putin of ordering the assassination of the Russian journalist Anna Politkovskaya in 2006.

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