Hadfield's best season was 1971–72. Named the team's captain after the trade of longtime captain Bob Nevin, he became the first Ranger - and only the sixth NHL player - to score 50 goals in a season, nearly doubling his previous best marks; with his linemates Ratelle and Gilbert, the GAG Line totalled 139 goals and 325 points en route to the Stanley Cup Finals.

The Rangers signed Hadfield to a controversial and lucrative contract the following summer to deter him from defecting to the newly created World Hockey Association. He scored fewer points thereafter and was traded to the Pittsburgh Penguins for Nick Beverley on May 28, 1974. He scored thirty goals in each of his two full seasons for the Penguins although he was plagued by injuries and weight troubles. Near the end of the 1975–76 season he sustained a knee injury which forced his retirement.

At the time of his retirement, Hadfield was fourth in Rangers' franchise history in goals, assists and points (behind his linemates Jean Ratelle and Rod Gilbert, and Andy Bathgate), second in penalty minutes (behind Harry Howell) and fourth in games played (behind Ratelle, Howell and Gilbert). He currently stands ninth in scoring and third in penalty minutes in the Rangers history.

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