Question: Who was a Jewish American mobster that was known as one of the most "infamous and feared gangsters of his day" and was also an associate and childhood friend of Harry Schachter or Harry "Big Greenie" Greenberg and ended up murdering him along with Whitey Krakow?

Context paragraphs:
Samuel Levine (mobster): Samuel "Red" Levine (December 27, 1902/1903(?)  – April 7, 1972) was an American mobster, described as head of Lucky Luciano's hit squad of Jewish gangsters.  According to several sources, he was an observant Jew and refrained from killing on the Sabbath if possible.

Cohen crime family: The Cohen crime family, or the Siegel crime syndicate, was an Italian-American Mafia / Jewish Mafia crime family created by New York Jewish American mobster Benjamin "Bugsy" Siegel in the early 1930s.  Siegel ran Los Angeles and later Las Vegas' illegal gambling and prostitution rings with his lieutenants Mickey Cohen, David Berman, Harold "Hooky" Rothman, Moe Sedway and boss of the L.A. family Jack Dragna.

Leonard Marsh (businessman): Leonard Marsh (January 5, 1933 – May 21, 2013) was an American businessman who co-founded the Snapple Beverage Corporation (now part of the Dr Pepper Snapple Group) in 1972.  Marsh co-founded Snapple, which was originally known as Unadulterated Food Products, with his brother-in-law, Hyman Golden, and childhood friend, Arnold Greenberg.

Danny Greene: Daniel John Patrick "Danny" Greene (November 14, 1933 – October 6, 1977) was an Irish American mobster and associate of Cleveland mobster John Nardi during the gang war for the city's criminal operations during the 1970s.  Competing gangsters set off more than 35 bombs, most attached to cars in murder attempts, many successful.  Greene had gained power first in a local chapter of the International Longshoremen's Association, where he was elected president in the early 1960s.  Greene pushed into Cleveland rackets and began competing with the Italian-American Mafia for control of the city.  He set up his own group called the Celtic Club, complete with enforcers.

Stanley Schachter: Stanley Schachter (April 15, 1922 – June 7, 1997) was an American social psychologist, who is perhaps best known for his development of the two factor theory of emotion in 1962 along with Jerome E. Singer.  In his theory he states that emotions have two ingredients: physiological arousal and a cognitive label.  A person's experience of an emotion stems from the mental awareness of the body's physical arousal.  Schachter also studied and published a large number of works on the subjects of obesity, group dynamics, birth order and smoking.  A "Review of General Psychology" survey, published in 2002, ranked Schachter as the seventh most cited psychologist of the 20th century.

Harry Davis (gangster): Harry Davis (born 1898 in Romania, died on July 25, 1946 in Montreal) was a Montreal gangster and the city’s last "edge man" (a strictly Montreal term used to signify the go-between for gamblers, politicians and police, the ‘edge’ was the undisputed boss of all vice in the city) back when the ‘Jewish Mafia’ ran the city.  Davis, a Jewish mobster, ran Montreal’s underworld for a year before he was shot to death in one of his betting emporiums at 1224 St. Catherine Street, by Louis Bercovitch (alias Joe Miller), a rival Jewish mobster.  Although Montreal was the gambling capital of Canada and known as a ‘wide open city’ across North America, Davis’ death shocked the public.  It acted as a wake up call for the masses of society in that it showed them, for the first time in almost a decade, that vice and organized crime in Montreal was real.  Public opinion and an increasingly involved press put pressure on the police to begin taking real action against vice within the city.

Kevin Weeks: Kevin Weeks (born March 21, 1956) is an American former mobster and a longtime friend and confidant to Whitey Bulger, the infamous boss of the Winter Hill Gang, a crime family based out of the Winter Hill neighborhood in Somerville, Massachusetts.

Bugsy Siegel: Benjamin "Bugsy" Siegel (February 28, 1906 – June 20, 1947) was a Jewish American mobster.  Siegel was known as one of the most "infamous and feared gangsters of his day".  Described as handsome and charismatic, he became one of the first front-page celebrity gangsters.  He was also a driving force behind the development of the Las Vegas Strip.  Siegel was not only influential within the Jewish mob but, like his friend and fellow gangster Meyer Lansky, he also held significant influence within the Italian-American Mafia and the largely Italian-Jewish National Crime Syndicate.

Harry Greenberg: Harry Schachter or Harry "Big Greenie" Greenberg was an associate and childhood friend of Bugsy Siegel, and an employee of both Charlie "Lucky" Luciano and Meyer Lansky.  On November 22, 1939, Greenberg was murdered by Bugsy Siegel and Whitey Krakow.  Siegel was eventually tried for the murders of Greenberg and Krakow, but was not convicted.

Jewish American literature: Jewish American literature holds an essential place in the literary history of the United States.  It encompasses traditions of writing in English, primarily, as well as in other languages, the most important of which has been Yiddish.  While critics and authors generally acknowledge the notion of a distinctive corpus and practice of writing about Jewishness in America, many writers resist being pigeonholed as "Jewish voices."  Also, many nominally Jewish writers cannot be considered representative of Jewish American literature, one example being Isaac Asimov.

Supporting paragraphs: Harry Greenberg Bugsy Siegel
Answer: Bugsy Siegel