on the Zinoviev letter into chapter four of her biography of SIS agent Desmond Morton. Another 2006 book on spycraft attributes authorship to Vladimir Orlov, a former intelligence agent of Baron Wrangel during the Russian Civil War. The British historian Nigel West wrote that the OPGU (Soviet secret police) always initiated investigations into leaks of Soviet documents and into mishandlings of propaganda, and the fact no investigation was opened after the publication of the Zinoviev letter indicates it was certainly a forgery. In 2011, Jonathan Pile published his book Churchill's Secret Enemy, detailing the mysterious career of Sir George Joseph Ball. Pile accessed Ball's papers (most of which Ball had attempted to destroy) from the Bodleian Library, along with other newly available sources. Pile's thesis, explained in the book, is that the Zinoviev letter was likely composed by Ball (at the time a long-serving MI5 officer) and his cohorts. In 2017, the British government claimed that it had "lost" a file on the Zinoviev letter scandal. The government added that they were unable to determine whether copies of the material had been made. In 2018, Bennett published her book The Zinoviev Letter: The Conspiracy that Never Dies. See also Campbell Case October surprise Zimmermann Telegram References Further reading Adelman, Paul. The decline of the Liberal Party 1910–1931 (Routledge, 2014). Bennett, Gill. The Zinoviev Letter: The Conspiracy that Never Dies (Oxford University Press, 2018). excerpt Chester, Lewis, Stephen Fay, and Hugo Young. The Zinoviev Letter (JB Lippincott, 1968). Girard, Pascal. "Conspiracy theories in Europe during the twentieth century." Routledge Handbook of Conspiracy Theories (Routledge, 2020) pp. 569–581. Lomas, Dan. "The Zinoviev letter." International Affairs 95.1 (2019): 201–206. Lomas, Dan. "The idea that the UK’s intelligence agencies have an anti-Labour bias runs deep–but it is false." British Politics and Policy at LSE (2021). online Madeira, Victor.. Britannia and the Bear: The Anglo-Russian Intelligence Wars, 1917–1929 (2015). excerpt Mowat, Charles Loch. Britain between the wars 1918–1940 (1955) pp. 188–194. online Taylor, A.J.P. English History 1914–1945 (1965) online External links The National Archives of Britain has made available the complete text of the Zinoviev Letter. Russia and the British voter: the 'Zinoviev Letter', 'Red Scare' and 1924 general election: digitised archives from the Modern Records Centre, University of Warwick, including the original Daily Mail article and a telegraphed denial of responsibility from Zinoviev. 1924 in the United Kingdom 1924 in British politics 1924 documents