Question: Bump and run coverage is a strategy often used by defensive backs in American football in which a defensive player lines up directly in front of a wide receiver and tries to impede him, which formercornerback, five-time Pro Bowler and a 1989 Pro Football Hall of Fame inductee of the Pittsburgh Steelers, specialized in this coverage to such a point as to cause a rule change?

Context articles: Cornelius Bennett
Josh Boyer
Bump and run coverage
Mel Blount
1976 Seattle Seahawks season
Ty Law
Rod Woodson
Bob Valesente
John Stallworth
Deacon Jones Trophy

Cornelius O'Landa Bennett (born August 25, 1965) is a former American football linebacker who played for the Buffalo Bills from 1987 to 1995, Atlanta Falcons from 1996 to 1998, and the Indianapolis Colts from 1999 to 2000.
 Bennett was a five-time Pro Bowler, being elected in 1988, and 1990–1993, and won the AFC Defensive Player of the Year award twice (1988 and 1991).
Josh Boyer (born January 21, 1977) is an American football coach in the National Football League, currently serving as cornerbacks coach for the New England Patriots.
 After graduating from Muskingum College, where he played football as a wide receiver and defensive back, he began his coaching career in 2000 as a graduate assistant at King's College, Pennsylvania, and then served in the same capacity at the University of Dayton in 2001 and Kent State University in 2002 and 2003.
 In 2004, Boyer served as the defensive backs coach at Bryant University.
 He then served as the defensive coordinator at the South Dakota School of Mines and Technology in 2005 before joining the New England Patriots in 2006 as a defensive coaching assistant.
 He was promoted to defensive backs coach following the 2008 season.
 In 2012, his title was changed to cornerbacks coach.
 On February 5, 2017, Boyer was part of the Patriots coaching staff that won Super Bowl LI.
 In the game, the Patriots defeated the Atlanta Falcons by a score of 34–28 in overtime.
Bump and run coverage is a strategy often used by defensive backs in American football in which a defensive player lines up directly in front of a wide receiver and tries to impede him with arms, hands, or entire body and disrupt his intended route.
 This originated in the American Football League in the 1960s, one of whose earliest experts was Willie Brown of the Oakland Raiders.
 Mel Blount of the Pittsburgh Steelers specialized in this coverage to such a point as to cause a rule change (see below) to make it easier for receivers to run their routes and increase scoring.
Melvin Cornell Blount (born April 10, 1948) is a former Pittsburgh Steelers cornerback, five-time Pro Bowler and a 1989 Pro Football Hall of Fame inductee.
The 1976 Seattle Seahawks season was the team's first season with the National Football League.
 The 1976 season was the team's only one in the NFC until the league realigned divisions before the 2002 season, at which point the Seahawks were once again placed in the NFC West.
 The Seahawks obtained a future Pro Football Hall of Fame inductee from the Houston Oilers, who had drafted receiver Steve Largent in the 4th round in 1976.
 Largent would go on to be a first-ballot Hall-of-Fame wide receiver, making it to seven Pro Bowls and recording over 13,000 receiving yards in a 13-year career with the Seahawks.
Tajuan E. "Ty" Law (born February 10, 1974) is a former American football cornerback who played fifteen seasons in the National Football League (NFL).
 He played college football at the University of Michigan.
 He was drafted by the New England Patriots 23rd overall in the 1995 NFL Draft.
 Law is a two-time All-Pro, a five-time Pro Bowl selection, a Pro Bowl MVP, and has won three Super Bowls with the Patriots.
 His 53 career interceptions rank 22nd all-time in NFL history.
 He is also widely regarded as one of the best Patriots defensive backs of all time.
 Law was added to the New England Patriots Hall of Fame as the 20th member.
Roderick Kevin Woodson (born March 10, 1965) is a former American football player who played in the National Football League (NFL) for seventeen seasons.
 He had a 10-year stint with the Pittsburgh Steelers and was a key member of the Baltimore Ravens' Super Bowl XXXV championship team that beat the New York Giants.
 He also played for the San Francisco 49ers and Oakland Raiders, wearing the jersey number 26 throughout his career.
 He holds the NFL record for interceptions returned for touchdown (12), and was named the NFL Defensive Player of the Year in 1993.
 His 71 career interceptions is the third-most in NFL history.
 He was an inductee of the Class of 2009 of the Pro Football Hall of Fame in Canton, Ohio on August 8, 2009.
 Woodson was inducted into the College Football Hall of Fame in 2016.
 Rod played most of career as a cornerback then switched to safety during the later part of his great career.
Bob Valesente (born July 19, 1940) is a former American football player and coach.
 He played college football at Ithaca College and spent more than 35 years as a football coach.
 He was the head coach of the Kansas Jayhawks football team from 1986 to 1987 and has also served as an assistant football coach in the National Football League with the Baltimore Colts (secondary and special teams, 1982–1983), Pittsburgh Steelers (linebackers coach, 1990–1991), Green Bay Packers (linebackers coach, 1992–1994; defensive backs, 1995–1998), and Carolina Panthers (defensive backs, 1999).
Johnny Lee Stallworth (born July 15, 1952) is a former American football wide receiver who played fourteen seasons in the National Football League for the Pittsburgh Steelers.
 He is considered to be one of the best wide receivers in NFL history.
 He played college football at Alabama A&M, and was the Steelers' fourth-round draft pick in 1974.
 Stallworth played in six AFC championships, and went to four Super Bowls. His career statistics included 537 receptions for 8,723 yards and 63 TDs.
 Stallworth's reception total was a franchise record until being surpassed by Hines Ward in 2005.
 Stallworth played in three Pro Bowls and was the Steelers' two-time MVP.
 He was inducted into the Pro Football Hall of Fame in 2002.
The Deacon Jones Trophy is an annual player of the year award given to the most outstanding all-around collegiate American football player of the year among teams from Historically Black Colleges and Universities.
 The trophy was named in honor of the late National Football League (NFL) player Deacon Jones, who played for South Carolina State and Mississippi Valley State University.
 Jones, who was drafted in the 14th round of the 1961 NFL Draft by the Los Angeles Rams, would go on to become a standout defensive end accumulating 173½ sacks over his career, earning unanimous All-NFL honors for 6 consecutive years from 1965 through 1970 and 8 Pro Bowl selections.
 Jones also holds the distinctions of being an inaugural Black College Football Hall of Fame inductee (2010) and a member of the Pro Football Hall of Fame.