Question: Who was attacked by the brother of a victim of the Saint Valentine's Day massacre?

Context paragraphs:
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.

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.

Museum of the American Gangster: The Museum of the American Gangster is a two-room museum located at 80 St. Mark's Place in the East Village, Manhattan New York City.  Opened in 2010, it is located upstairs from a former speakeasy in a neighborhood once frequented by Al Capone, Lucky Luciano, and John Gotti.  Its Exhibition of the American Gangster was "founded to preserve newspapers, photographs and other original documents from the Prohibition Era".  The museum's collection of memorabilia of organized crime in America includes John Dillinger's death masks, bullets from the Saint Valentine's Day massacre investigation, and a bullet from the shooting of Pretty Boy Floyd.  The former speakeasy has a history of its own; the building is the former residence of Walter Scheib.  The exhibit is currently open.  It is also possible to tour the old speakeasy.

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.

Some Like It Hot: Some Like It Hot is a 1959 American romantic comedy film set in 1929, directed and produced by Billy Wilder, starring Marilyn Monroe, Tony Curtis, and Jack Lemmon.  The supporting cast includes George Raft, Pat O'Brien, Joe E. Brown, Joan Shawlee, and Nehemiah Persoff.  The screenplay by Billy Wilder and I.A.L. Diamond is based on a screenplay by Billy Wilder and Michael Logan from the French film "Fanfare of Love".  The film is about two musicians who dress in drag in order to escape from mafia gangsters whom they witnessed commit a crime inspired by the Saint Valentine's Day Massacre.  The film was produced in black and white, even though color films were increasing in popularity.

Lexington Hotel: 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.

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.

Valentine's Day: Valentine's Day, also called Saint Valentine's Day or the Feast of Saint Valentine, is an annual holiday celebrated on February 14.  It originated as a Western Christian liturgical feast day honoring one or more early saints named "Valentinus", and is recognized as a significant cultural and commercial celebration in many regions around the world, although it is not a public holiday in any country.

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.

Saint Valentine's Key: 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.

Supporting paragraphs: Peter Gusenberg Frank Gusenberg
Answer: Al Capone