In June of 1967 Tom Yawkey was fed up with Massachusetts and Boston politicians. He was upset that a proposed stadium at South Station was not approved.
He gave an interview to Will McDonough and said if no new stadiumwas built, he would move the Red Sox.
YAWKEY WILL MOVE RED SOX IF NEW STADIUM IS NOT BUILT
Boston Globe - June 21,1967
Luckily for New England that became the summer that saved baseball in Boston and Yawkey was suddenly happy with Fenway.