Alexander Valterovich Litvinenko (30 August 1962– 23 November 2006) was an officer who served in the Soviet KGB and its Russian successor, the Federal Security Service (FSB). In November 1998, Litvinenko and several other FSB officers publicly accused their superiors of ordering the assassination of Russian tycoon and oligarch Boris Berezovsky. Litvinenko was arrested the following March on charges of exceeding his authority at work. 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 became a journalist and writer.