Benjamin "Bugsy" Siegel pulled himself out of poverty by joining a gang headed by immigrant Meyer Lansky. During the Prohibition Era, Lansky and Siegel ran a large bootlegging operation and were influential in Jewish and Italian immigrant crime syndicate communities. In the 1930s, after organized crime made the gangster fabulously wealthy, Siegel moved to sunny Southern California, where he would continue his illegal activities.
It was there he met Dorothy di Frasso, an Italian Countess, at one of the her extravagant Beverly Hills parties. They began to travel the world together. Eventually, they invested in a new explosive called "radium-atomite" and sail for Italy in 1941, hoping to sell it to Italian Dictator Benito Mussolini.
Count Galeazzo Ciano, Mussolini's son-in-law and foreign minister, was skeptical of the invention after the demonstration of the weapons went poorly. Ciano took a pass. Unfortunately for the Italians that very next year, the scientist developing the explosive would refine his product into a form of jellied nitroglycerin, an explosive more powerful and cheaper to produce than TNT and easier to transport than liquid nitroglycerin. When that scientist patented the explosive, Di Frasso's name was on the patent as the owner.
While Siegel and Di Frasso were in Rome, the Nazi Luftwaffe commander, Gestapo founder, and Reichstag President Hermann Göring was there as well -- fresh from annexing Czechoslovakia and ready to discuss the invasion of Poland. Meanwhile, the Beverly Hills couple were meeting all sorts of notable figures, including the new Pope Pius XII, Italian King Victor Immanuel II and his son Umberto II, and Mussolini himself.
Siegel and di Frasso eventually ran into Reichsmarschall Göring. Siegel's daughter, who was eight-years-old at this time, remembered that her father was so angered by one of the men he met in Italy that he "wished he had shot him." The story goes that the villa the couple were supposed to stay in as guests of the Italian government was taken by Göring, so the couple would have to be moved to less lavish quarters. Siegel, a Jewish American, unhappy with the treatment of Jews in Nazi-occupied areas and with the government anti-Semitic ideology, told friends and associates he wanted to kill the German Reichsmarschall, after meeting Göring just one time.
It was rumored Siegel also wanted to take out infamous Nazis Joseph Goebbels and Heinrich Himmler, but those rumors are unsubstantiated. The mobster would outlive Göring. The Reichsmarschall would famously kill himself with cyanide before he could be hanged at Nuremburg after the war.
For his part, Siegel would be gunned down in his Beverly Hills home by a different mistress in 1947.