The identity of Jack the Ripper is a notorious example of an outstanding cold case , with numerous suggestions as to the identity of the serial killer . Similarly , the Zodiac Killer has been studied extensively for almost 50 years , with numerous suspects discussed and debated . The perpetrators of the Wall Street bombing of 1920 have never been positively identified , though the Galleanists , a group of Italian anarchists , are widely believed to have planned the explosion . The burning of the Reichstag building in 1933 remains controversial and although Marinus van der Lubbe was tried , convicted and executed for arson , it is possible that the Reichstag fire was perpetrated by the Nazis to enhance their power and destroy democracy in Germany
Wall Street bombing
Wall Street bombing
Cold case