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?

Context articles: Scarface (1932 film)
Robert Carey (gangster)
Fred Burke
Saint Valentine's Day massacre (disambiguation)
Lexington Hotel
Saint Valentine's Day Massacre
Frank Gusenberg
St. Valentine's Day Massacre: In Your House
Saint Valentine's Key
Peter Gusenberg

Scarface (also known as Scarface: The Shame of the Nation and The Shame of a Nation) is a 1932 American pre-Code gangster film starring Paul Muni as Antonio "Tony" Camonte.
 It was produced by Howard Hughes and Howard Hawks and directed by Hawks.
 The story is based on Armitage Trail's 1929 novel of the same name, which is loosely based on the rise and fall of Al Capone.
 The film features Ann Dvorak as Camonte's sister, and also stars Karen Morley, Osgood Perkins, and Boris Karloff.
 The plot centers on gang warfare and police intervention when rival gangs fight over control of Chicago.
 A version of the Saint Valentine's Day Massacre is also depicted.
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.
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.
The Saint Valentine's Day Massacre is a name given to a gangland shooting that occurred on Saint Valentine's Day, February 14, 1929.
The Lexington Hotel was a ten-story hotel in Chicago at 2135 S. Michigan Avenue that was built in 1892 (or 1891) for attendees of the Columbian Exposition.
 The hotel is notable for being Al Capone's primary residence from July 1928 until his arrest in 1931.
 After the Saint Valentine's Day Massacre, some commenters called the hotel "Capone's Castle."
 It was later renamed "The New Michigan Hotel" and functioned as a brothel with 400 rooms.
 The hotel closed in 1980.
 On April 21, 1986 locked vaults found in the hotel were subject to a live television program called "The Mystery of Al Capone's Vaults", which received 30 million viewers.
 The building was demolished in 1995, in spite of the building being landmarked.
 The location where the hotel once stood is currently the site of a 296 unit residential high rise called "The Lex" that was completed in 2012.
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.
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.
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.
Saint Valentine’s key is a charm used in the province of Padua, Italy.
 It is a metal key named after Saint Valentine, the patron saint of love and marriage, but also believed to offer a cure for epilepsy, traditionally known as ""Saint Valentine's Malady"".
 It was once common in southern Germany, eastern Switzerland, Austria, and northern Italy to appeal to him to heal the latter condition, known for that reason as Saint Valentine's affliction.
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.