Question: What German-American Contract killer that was a member of Chicago's North Side Gange was a vitvim of the Saint Valentine's Day massacre?

full_context: Document 1: Frank Schweihs: Francis John Schweihs (February 7, 1932 – July 23, 2008), aka "Frank the German", was an American gangster, who worked for The Outfit, the organized crime family of Chicago. At the time of his death, federal prosecutors planned to indict him for numerous crimes, including murder. It is believed he had participated in, or had knowledge of, many murders going back decades, including brothers Anthony "Tony the Ant" Spilotro and Michael Spilotro, Allen Dorfman of the Teamsters Union, a disgraced Chicago cop, Outfit associate and informant Dick Cain, Outfit boss Salvatore "Sam," "Mooney" Giancana, loanshark Sam "Mad Sam" DeStefano, Outfit hitman Charles "Chuckie" Nicoletti and others.
Document 2: Genna crime family: The Genna crime family, was a Prohibition era crime family in Chicago. From 1921 to 1925, the family was headed by the six Genna brothers, known as the "Terrible Gennas". These brothers were Sicilians from the town of Marsala and operated from Chicago's Little Italy and maintained control over the Unione Siciliana. They were allies with fellow Italian gang the Chicago Outfit. After a bloody war led to their demise in the 1920s, the gang was eventually absorbed by the Chicago Outfit.
Document 3: Shooting of Eddie Hutch Snr: The shooting of Eddie Hutch Snr occurred on 8 February 2016. Eddie was the brother of Gerry Hutch, the leader of the Hutch gang, which was in a feud with the Kinahan gang, led by Christy Kinahan. The feud of the two criminal gangs, called the 2015–16 Irish gangland feud, in the Republic of Ireland resulted in the deaths of ten people.
Document 4: Ralph Capone: Ralph "Bottles" Capone, Sr., (January 12, 1894 – November 22, 1974) was a Chicago mobster and an older brother of Al Capone and Frank Capone. Ralph Capone got the nickname "Bottles" not from involvement in the Capone bootlegging empire, but from his running the legitimate non-alcoholic beverage and bottling operations in Chicago. Further family lore suggests that the nickname was specifically tied to his lobbying the Illinois Legislature to put into law that milk bottling companies had to stamp the date that the milk was bottled on the bottle. He was most famous for being named by the Chicago Crime Commission "Public Enemy Number Three" when his brother Al was "Public Enemy Number One".
Document 5: Charles Nicoletti: Charles "Chuckie" Anthony Nicoletti (December 3, 1916 - March 29, 1977), also known as "The Typewriter" and "Chuckie Typewriter", was a top Chicago Outfit hitman under Outfit boss Sam Giancana before and after Giancana's rise and fall.
Document 6: George Musey: George Musey, also known as "one-armed George Musey", was an associate mob boss in Galveston, Texas, during the 1920s and early 1930s. He, with the "Beau Brummel of Galveston" Johnny Jack Nounes, led the Downtown Gang, one of the two gangs which controlled Galveston underworld until the early 1930s. Musey was the gang's top enforcer and would not let anyone ruin the rise of the Downtown Gang. Bootlegging was his specialty, therefore, when the law would arrive to seize the illegal hooch, Musey always escaped. However, he was convicted on conspiracy liquor charges and sent to Atlanta Penitentiary. He went on to head the gang as Nounes's absence was in effect due to his prison terms. He was the only right-hand man to gang boss Nounes and he was the best acting boss the gang ever had. He was later assassinated in 1935, eight days after his 35th birthday.
Document 7: Al Capone: Alphonse Gabriel Capone ( ; ] ; January 17, 1899 – January 25, 1947), sometimes known by the nickname Scarface, was an American mobster, crime boss and businessman who attained fame during the Prohibition era as the co-founder and boss of the Chicago Outfit. His seven-year reign as crime boss ended when he was 33 years old.
Document 8: Peter Gusenberg: Peter Gusenberg a.k.a. ""Goosey"" (September 22, 1888 – February 14, 1929) and his brother Frank were German-American contract killers and members of Chicago's North Side Gang, the main rival to the Chicago Outfit. Peter Gusenberg participated in an infamous attack on Al Capone during a vicious gang war.
Document 9: Robert Carey (gangster): Robert "Bob" Carey (August 25, 1894 – July 30, 1932) was a Midwestern armed robber and contract killer responsible for many crimes during the Prohibition era. He is considered a suspect in the infamous St. Valentine's Day Massacre of 1929.
Document 10: Forty-Two Gang: The Forty-Two Gang is a teenage street gang in Chicago that started during the Prohibition. Like Brooklyn's Italian and Jewish street gangs of Brownsville and Ocean Hill, the Forty-Two Gang serves as a "farm team" for future members of the Chicago Outfit. Forty-Two gang members include future syndicate members Sam "Teets" Battaglia, Louis "Cockeyed Louie" Fratto (also known as Lew Farrell), Felix Alderisio ("Milwaukee Phil"), Samuel DeStefano ("Mad Sam"), Charles "Chuckie" Nicoletti, Fiore "Fifi" Buccieri, Albert Frabotta, William "Smokes" Aloisio, Frank "Skids" Caruso, William Daddano ("Willie Potatoes"), Joe Caesar DiVarco, Rocco Potenza, Leonard Gianola, Vincent Inserro and brothers Leonard, Marcello Giovanni Caifano ("John Marshall"), Mario DeStefano, Bruno Tassione, and Joey "Cowboy" Miletta.
Document 11: St. Valentine's Day Massacre: In Your House: St. Valentine's Day Massacre: In Your House was the 27th In Your House pay-per-view from the World Wrestling Federation (WWF). It took place on February 14, 1999, at The Pyramid in Memphis, Tennessee. The title of the event alludes to the Saint Valentine's Day massacre of 1929, which saw seven people murdered as part of the gang war between Al Capone and Bugs Moran. The event saw the WWF debut of Big Show, who was referred to by his real name, Paul Wight, during the event.
Document 12: Saint Valentine's Day massacre (disambiguation): The Saint Valentine's Day Massacre is a name given to a gangland shooting that occurred on Saint Valentine's Day, February 14, 1929.
Document 13: Frank Gusenberg: Frank Gusenberg (October 11, 1893 – February 14, 1929) was a German-American contract killer and a victim of the Saint Valentine's Day massacre in Chicago, Illinois.
Document 14: Saint Valentine's Day Massacre: The Saint Valentine's Day Massacre is the name given to the 1929 murder in Chicago of seven men of the North Side gang during the Prohibition Era. It happened on February 14, and resulted from the struggle between the Irish American gang and the South Side Italian gang led by Al Capone to take control of organized crime in the city. Former members of the Egan's Rats gang were suspected of a significant role in the incident, assisting Capone.
Document 15: Fred Burke: Fred "Killer" Burke (May 29, 1893 – July 10, 1940) was a Midwestern armed robber and contract killer responsible for many crimes during the Prohibition era. He is considered a prime suspect in the infamous St. Valentine's Day Massacre of 1929.
ground_truth: Frank Gusenberg