Question: What does the Allegis Group, founded by current majority owner of the Baltimore Ravens, do?
Context: Berth Milton Sr. (26 November 1926 – 31 December 2005) was a Swedish pornographer and businessman.  He founded Private Media Group, the first commercial company to produce a full-color hardcore pornographic magazine in 1965.  Later, he went on to build one of the most renowned brand names in modern pornography.  He was the father of Berth Milton Jr., the current majority owner and former CEO. Allegis Group, headquartered in Hanover, Maryland, in the United States, is one of the largest privately held staffing and recruitment services companies in the world, with $11 billion in revenue in 2015.  Founded in 1983 by Steve Bisciotti and Jim Davis, the company, then known as Aerotek, originally focused on providing technically skilled people to the expanding engineering and aerospace industry.  Jim Davis still has majority control of Allegis Group.  Bisciotti has turned his attention to his ownership of the National Football League's Baltimore Ravens. The Baltimore Ravens season was the team's 16th in the National Football League and city of Baltimore, and the 14th to host home games at M&T Bank Stadium.  2011 marked one of the most successful seasons in Baltimore Ravens franchise history.  The Ravens completed the season with a 12–4 record, matching their record from 2010, and winning the AFC North division title for the third time in franchise history.  By earning a playoff berth in 2011, the Ravens set a franchise record by going to the postseason for four consecutive seasons. Stephen J. Bisciotti (born April 10, 1960) is the current majority owner of the Baltimore Ravens of the National Football League.  He founded a family of technical staffing companies known as Allegis Group, which owns Maxim Healthcare, Aerotek, and TEKsystems. Native American Services Corp. is a 51% Native American Owned, 8(a) and HUBzone certified company, located in Northern Idaho's Silver Valley.  The company was founded in 1998 by Dennis "Rusty" Sheppard and branded as "Environmental Indian Construction (EIC)".  The first contract awarded to the company was the demolition of the NCO club at Malmstrom Air Force Base.  In 2002, current majority owner and CEO Matthew D. James purchased controlling interest in the small company and changed the name from EIC to Native American Services Corp (NASCO). The Baltimore Ravens Cheerleaders are a cheerleading and dance squad for the Baltimore Ravens of the National Football League.  Unlike other NFL Cheerleading squads, the Ravens squad is a co-ed squad, with the female cheerleaders doing various dance moves, and the males working on stunts, as in traditional cheerleading.  The group was founded in 1998, and currently consists of 48 members (20 stunt team performers and 28 dancers).  The squad performs at the Ravens home stadium M&T Bank Stadium.  The squad's director is Tina Galdieri, who cheered at the 1996 Summer Olympics in Atlanta, as well as the WLAF's (later NFL Europe) Barcelona Dragons, and also led the University of Maryland's cheerleading squad to a National Championship in 1999.  The squad also has a "Lil Ravens" summer program, and unlike the other squads, boys also are permitted to join.  The group makes various appearances at parties and corporate functions throughout the year.  The female members of the squad also has a swimsuit calendar, with their 2012 calendar taking place in the Bahamas.  The squad currently has 31 female members. Herman Joseph Arvie (born October 12, 1970) is a retired American professional football player who played four seasons in the National Football League as an offensive tackle with the Cleveland Browns and Baltimore Ravens.  Arvie was drafted by the Browns out of Grambling State University in the fifth round of the 1993 NFL Draft.  Arvie played three seasons with the Browns before the franchise moved to Baltimore and became the Baltimore Ravens.  With the Ravens in 1996, Arvie scored his only touchdown, scoring on a one-yard reception.  After the 1996 season, Arvie retired from football. Baltimore's Marching Ravens are the official marching band of the Baltimore Ravens American football team.  They were founded as the Baltimore Colts' Marching Band on September 7, 1947 and have continuously operated ever since, supporting three separate football franchises.  The band first supported the original Baltimore Colts from 1947 to 1950, but continued to operate even after the franchise disbanded in 1950.  After a new Baltimore Colts franchise was installed in 1953, the band became associated with the newly founded team.  The band endured a second relocation when the Colts moved to Indianapolis in the middle of the night in 1984, leaving Baltimore without a team for eleven years.  The band became attached to a third franchise when the Cleveland Browns relocated to Baltimore in 1996 and became the Ravens.  They are one of two official marching bands in the NFL, the other being the Washington Redskins Marching Band. The Baltimore Orioles are an American professional baseball team based in Baltimore, Maryland.  The Orioles compete in Major League Baseball (MLB) as a member of the American League (AL) East division.  As one of the AL's original eight charter franchises when the league was established in 1901, this particular franchise spent its first year as a major league club in Milwaukee, Wisconsin, as the Milwaukee Brewers before moving to St. Louis, Missouri to become the St. Louis Browns.  After 52 often-beleaguered years in St. Louis, the franchise was purchased in November 1953 by a syndicate of Baltimore business and civic interests led by attorney/civic activist Clarence Miles and Mayor Thomas D'Alesandro, Jr. The team's current majority owner is lawyer Peter Angelos. Issac Ramoun Booth (born May 23, 1971) is a former American professional football player who played three seasons in the National Football League with the Cleveland Browns and Baltimore Ravens.  Booth was drafted by the Browns in the fifth round of the 1994 NFL Draft and played cornerback for the Browns for the 1994 and 1995 seasons, earning one start in each of his first two seasons.  After the 1995 season the original Cleveland Browns relocated to Baltimore, Maryland and became the Baltimore Ravens.  Booth played his final season with the Ravens playing in 11 games and earning a career high three starts.  Booth retired from football after the 1996 season.  During his brief career, Booth played in 36 games, earning five starts, 55 tackles, two interceptions and one forced fumble.
Answer: one of the largest privately held staffing and recruitment services companies in the world