Why Marty Walsh left the Biden administration to run the NHL players’ association

Marty Walsh wasn’t a man in a hurry to leave the Biden administration. Less than halfway through the president’s term, Walsh was in a comfortable spot in the Cabinet as labour secretary. Then he got a call about an interesting opportunity: running the NHL Players’ Association. The former mayor of Boston and longtime Bruins fan was intrigued and earlier this year accepted the role as executive director. Now three months in, Walsh is trying to get to know players and what they care about most, learning about everything from the Arizona Coyotes’ arena situation to the salary cap and future…