Angel Rubio (born April 12, 1975) is a former American football defensive end who played one season with the Arizona Cardinals of the National Football League (NFL).
 He was drafted by the Pittsburgh Steelers in the seventh round of the 1998 NFL Draft.
 Rubio played college football at Southeast Missouri State University and attended Ceres High School in Ceres, California.
 He was also a member of the San Francisco 49ers, Cincinnati Bengals, Orlando Predators, Las Vegas Outlaws, Detroit Fury, Dallas Desperados and Austin Wranglers.
James Henry Hundon (born April 9, 1971) is a former American football wide receiver who played four seasons with the Cincinnati Bengals of the National Football League.
 He first enrolled at City College of San Francisco before transferring to Portland State University.
 He attended Jefferson High School in Daly City, California.
 Hundon was also a member of the San Jose SaberCats, San Francisco Demons, Toronto Argonauts and Calgary Stampeders.
 He was featured on the cover of Sports Illustrated following week one of the XFL season.
Chad "Chuck" Clements (born September 29, 1973) is a former American football quarterback who played one season with the New York Jets of the National Football League (NFL).
 He was drafted by the New York Jets in the sixth round of the 1997 NFL Draft.
 He played college football at the University of Houston and attended Huntsville High School in Huntsville, Texas.
 He was also a member of the Philadelphia Eagles, Denver Broncos, Berlin Thunder, Las Vegas Outlaws and Ottawa Renegades.
 Clements was drafted fifth overall by the Las Vegas Outlaws in the 2001 XFL Draft but, because of a preseason injury, never played for them.
Hurley Tarver (born November 30, 1975) is a former American football defensive back.
 He played college football at the University of Central Oklahoma and attended Western Hills High School in Benbrook, Texas.
 He was a member of the San Francisco 49ers, Cleveland Browns, Scottish Claymores, Dallas Cowboys, Las Vegas Outlaws, Green Bay Packers, Tampa Bay Storm, Chicago Rush, Toronto Argonauts and Las Vegas Gladiators.
The Las Vegas metropolitan area is home to many sports, most of which take place in the unincorporated communities around Las Vegas rather than in the city itself.
 The Las Vegas Valley has one major league professional team: the Vegas Golden Knights of the National Hockey League (NHL) who began play in 2017 as the region's first major pro team.
 The Oakland Raiders of the National Football League (NFL) will begin play in Las Vegas as the "Las Vegas Raiders" by 2020 and become the region's second major professional team.
 Las Vegas is also home to one minor league sports team: the Las Vegas 51s of the Triple-A Pacific Coast League (Minor League Baseball).
 The 51s are currently the only team to actually play in the city of Las Vegas, playing at the city owned Cashman Field.
 They will be joined in 2018 by the Las Vegas Lights FC of the United Soccer League, one of two leagues that collectively make up the second level of the U.S. men's soccer league system.
The Los Angeles Xtreme was a professional American football team based in Los Angeles, California.
 The team was a member of the XFL begun by Vince McMahon of World Wrestling Entertainment and by NBC, a major television network in the United States.
 The team played its home games in the Los Angeles Memorial Coliseum in the spring of 2001.
 They were in the XFL's Western Division with the San Francisco Demons, the Memphis Maniax and the Las Vegas Outlaws.
 The team had the league's best passing offense and was nicknamed "L.A.X." as a pun on the IATA code for Los Angeles International Airport.
 They finished the season in 1st place with a 7-3 record and defeated the Chicago Enforcers in the Playoffs and the San Francisco Demons in the Million Dollar Game with a score of 38-6 to win the league's sole Championship.
The San Francisco Demons (originally named San Jose Demons) were a short-lived springtime American football team based in San Francisco, California.
 This team was part of the failed XFL begun by Vince McMahon of World Wrestling Entertainment and by NBC, a major television network in the United States.
 Originally they were to be based in San Jose but prior to the start of the season they were moved to San Francisco.
 They were in the Western Division with the Los Angeles Xtreme, Las Vegas Outlaws and Memphis Maniax.
The Las Vegas Outlaws were an American football team in the XFL.
 They played in the Western Division with the Los Angeles Xtreme, San Francisco Demons and Memphis Maniax.
 They played their home games at Sam Boyd Stadium.
 The Outlaws hosted the first nationally televised XFL game on NBC against the New York/New Jersey Hitmen.
The Las Vegas Outlaws season was the first and only season for the expansion franchise in the Arena Football League.
 The team was coached by Aaron Garcia and played their home games at Thomas & Mack Center.
 The Outlaws finished their inaugural season 5–12–1, with the tie being a cancelled home game against the VooDoo.
 Though they qualified for the playoffs, the league announced on August 9 that the Outlaws (along with the VooDoo) would cease operations effective immediately, and would therefore not participate in the playoffs.
The Las Vegas Outlaws were a professional Arena Football League (AFL) team based in Las Vegas, Nevada.
 They played in the AFL's National Conference West Division in 2015.
 The franchise was recently owned by Vince Neil, lead singer for Mötley Crüe and former minority owner of the Jacksonville Sharks.
 On September 11, 2014, it was announced that Aaron Garcia was to be the team's first head coach.

Question: What league were the Las Vegas Outlaws and the San Francisco Demons apart of?
Answer: part of the failed XFL