Question: What is a massacre that occurred as part of an attempt to free a federal prisoner was Vernon C. Miller a gunman in?

Context paragraphs:
Velika Ivanča shooting: A spree shooting occurred in the Serbian village of Velika Ivanča in the early hours of 9 April 2013.  Fourteen people (including the gunman) died and one, the gunman's wife, was injured.  Police identified the gunman as 59-year-old Ljubiša Bogdanović, a relative of many of the victims.  Bogdanović died of his injuries on 11 April 2013.  The massacre was the deadliest in the country since the end of the Yugoslav Wars.

Vernon C. Bain Correctional Center: The Vernon C. Bain Center (VCBC), also known as the Vernon C. Bain Maritime Facility and under the nickname "The Boat", is an 800-bed jail barge used to hold inmates for the New York City Department of Corrections.  It was built in New Orleans along the Mississippi River for $161 million in Avondale Shipyard, and brought to New York in 1992 to reduce overcrowding in the island's land-bound buildings for a lower price.  Nicknamed "The Boat" by prison staff and inmates, it is designed to handle inmates from medium- to maximum-security in 16 dormitories and 100 cells.

Clayton Fountain: Clayton Anthony Fountain (September 12, 1955 – July 12, 2004) was a federal prisoner, member of the Aryan Brotherhood, and convicted murderer.  Clayton was born on September 12, 1955, at the U.S. Army Hospital in Fort Benning, Georgia.  Clayton was the oldest of six children, having one brother and four sisters, and was named after his father, Clayton Raleigh Fountain.  The family moved every 1½ to 2 years.  While his father served combat tours in Korea and Vietnam and his mother was working, Clayton, as the oldest child in family, became a surrogate for both parents when he was very young.  He recalled maternal responsibilities for cooking, ironing, serving, cleaning, and caring for his young siblings.  It was the male/paternal role, however, for which his father had carefully trained him.  While serving in the Marines, he was convicted of murdering his staff sergeant in 1974, while stationed in the Philippines.  He was sentenced to life imprisonment, and was ultimately sent to the United States Penitentiary, Marion, which was at the time the highest-security prison in the nation.  Fountain used his military training to murder three prisoners and one correctional officer with a homemade knife while serving time at Marion, and was labeled the "Most Dangerous Prisoner" in the federal system.

Mercaz HaRav massacre: The Mercaz HaRav massacre, also called the Mercaz HaRav shooting, was a mass shooting attack that occurred on 6 March 2008, in which a lone Palestinian gunman shot multiple students at the Mercaz HaRav yeshiva, a religious school in Jerusalem, Israel, after which the gunman himself was shot dead.  Eight students and the perpetrator were killed.  Eleven more were wounded, five of them placed in serious to critical condition.

John Franzese: John "Sonny" Franzese, Sr. (born February 6, 1917) is an Italian-born American longtime member and current underboss of the Colombo crime family.  At the time of his release on June 23, 2017, he was the oldest federal prisoner in the United States and the only centenarian in federal custody.  Arguably, Franzese has been famous as the current oldest active member of the American Mafia.  Franzese is listed as an associate producer of the 2002 film "This Thing of Ours", which stars James Caan.

Vernon C. Miller: Vernon C. Miller (August 25, 1896 – November 29, 1933) was a freelance Prohibition gunman, bootlegger, bank robber and former sheriff in Huron, South Dakota, who, as the only identified gunman in the Kansas City massacre, was found beaten and strangled to death shortly after the incident.

Bernard Coy: Bernard Paul "Barney" Coy (February 13, 1900 – May 4, 1946) was a bank robber and federal prisoner best known as the planner of a failed escape attempt from Alcatraz prison, on May 2, 1946 which turned into a bloody two day armed confrontation leaving Coy, two fellow would-be escapees and two prison guards dead.

Robert Stroud: Robert Franklin Stroud (January 28, 1890 – November 21, 1963), known as the "Birdman of Alcatraz", was an American federal prisoner and author who has been cited as one of the United States' most notorious criminals.  During his time at Leavenworth Penitentiary, he reared and sold birds and became a respected ornithologist, but because of regulations, he was not permitted to keep birds at Alcatraz, where he was incarcerated from 1942 to 1959.  Stroud was never released from the Federal prison system.

Jonathan Lee Riches: Jonathan Lee Riches (born December 27, 1976) is a former federal prisoner (inmate #40948-018) known for the many lawsuits he has filed in various United States district courts.  Riches was incarcerated at Federal Medical Center, Lexington, Kentucky, for wire fraud under the terms of a plea bargain.  His release date was April 30, 2012.  He was arrested for violating his federal probation in December 2012, when he left the Eastern District of the state of Pennsylvania without permission.  He allegedly drove to Connecticut and impersonated the uncle of Adam Lanza, the shooter in the Sandy Hook Elementary School incident.

Kansas City massacre: The Kansas City massacre was the shootout and murder of four law enforcement officers and a criminal fugitive at the Union Station railroad depot in Kansas City, Missouri, on the morning of June 17, 1933.  It occurred as part of the attempt by a gang led by Vernon Miller to free Frank "Jelly" Nash, a federal prisoner.  At the time, Nash was in the custody of several law enforcement officers who were returning him to the U.S. Penitentiary at Leavenworth, Kansas, from which he had escaped three years earlier.

Supporting paragraphs: Vernon C. Miller Kansas City massacre
Answer: Kansas City massacre