From Hell letter claiming to be from the killer were posted at the time of the Ripper murders, but many researchers argue that the "From Hell" letter is one of a handful of possibly authentic writings received from the murderer. Its author did not sign it with the "Jack the Ripper" pseudonym, distinguishing it from the earlier "Dear Boss" letter and "Saucy Jacky" postcard, as well as their many imitators. The handwriting is also similar in the earlier two messages but dissimilar in the one "From Hell". The letter was delivered to Lusk personally without reference to the police or to the British
Enigma (2001 film) of the British to decode the Naval enigma from 10 to 19 March 1943 when the third edition of the weather short signal codebook was deployed. The Katyn massacre, revealed after the discovery of mass graves of 4,500 Polish officers as depicted in the film, is a historical atrocity committed by Stalinist Russia in 1940. There is no evidence that details of the mass graves were intercepted by British intelligence, although it is possible. The first announcement of the discovery was broadcast by Radio Berlin on 13 April 1943. Enigma (2001 film) Enigma is a 2001 espionage thriller film directed