Answer by taking a quote from the following article:

Paul Dryden Warfield (born November 28, 1942) is a former professional American football wide receiver who played in the National Football League (NFL) from 1964 to 1977 for the Cleveland Browns and Miami Dolphins, except for a year in the World Football League (WFL) with the Memphis Southmen. He was known for his speed, fluid moves, grace, and jumping ability. A consistent big-play threat throughout his career, his 20.1 average yards per reception is the highest in NFL history among players with at least 300 receptions. As a star halfback in college for the Ohio State Buckeyes football team, Warfield was twice named to the All-Big Ten Conference team.

The Cleveland Browns selected Warfield with the eleventh pick of the 1964 NFL Draft. Browns owner Paul Brown intended for Warfield to play as a defensive back. But during workouts prior to the season, his play as a wide receiver impressed head coach Blanton Collier, and he was converted to the position. In his rookie season, he caught 52 passes for 920 yards and nine touchdowns. He averaged 17.8 yards per reception, and his speed served to compliment the power of star running back Jim Brown. The Browns finished the season atop the East Division with a 10-3-1 record, and defeated the Baltimore Colts 27-0 in the 1964 NFL Championship Game. Warfield was invited to his first Pro Bowl and was named a first-team All-Pro by the Newspaper Enterprise Association (NEA).  In the 1965 Chicago College All-Star Game, which annually pitted the reigning NFL champion against star college players, Warfield shattered his collarbone and missed the majority of the 1965 season as a result. He returned for the penultimate game of the season and caught three passes for 30 yards before bruising his collarbone, causing him to miss the final game of the regular season. The Browns returned to the NFL Championship Game in 1965, in which Warfield caught two passes for 30 yards in a 23-12 loss to the Green Bay Packers.  Warfield returned to form in 1966, catching 36 passes for 741 yards and five touchdowns, and in 1967 recorded 32 receptions for 702 yards and eight touchdowns. In 1968, Warfield caught 50 passes and for the only time in his career eclipsed 1,000 receiving yards, finishing with 1,067. His career-high 12 receiving touchdowns led the league that year. The Browns again reached the NFL Championship Game, where they were shutout by the Baltimore Colts, 34-0. Warfield earned first-team All-Pro honors from the Associated Press (AP), United Press International (UPI), Pro Football Weekly, and NEA, and made another Pro Bowl appearance.  After another NFL championship game appearance for the Browns and Pro Bowl season for Warfield in 1969, he was traded to the Miami Dolphins for the third pick in the 1970 draft. The trade came as a shock to Warfield, who had established himself as one of the Browns' most popular players. "I have to admit going to Miami was not a place I desired to go," said Warfield 30 years later. The Browns used the pick acquired in the trade on Purdue University quarterback Mike Phipps. The trade is considered one of the most lopsided in NFL history, as Phipps had only limited success for the Browns, while Warfield was a major factor in the Dolphins' championships in the early 1970s.

Who were the Cleveland Browns?
The Cleveland Browns selected Warfield with the eleventh pick of the 1964 NFL Draft.