For a while, at least, the annual bowling party for the Jim Evans Academy for Professional Umpiring was a typical company outing. Employees drafted teams, concocted humorous names and went to the local alley to compete for bragging rights.

It did not stay normal for long. Over the course of that evening last month in Kissimmee, Fla., one team of employees bowled under a name that invoked the Ku Klux Klan. The team had entered the alley wearing costumes that played off the racist group’s distinctive regalia.

In the following days, one of the school’s instructors, the lone black employee, expressed unease over the night to his superiors. He also circulated photographs of the evening to a colleague.

This week, the black employee’s unease has led to this: the president of Minor League Baseball informed the Evans Academy that it would sever ties with the school and no longer accept its students into the professional ranks.