Alex Zimmerman of Chalkbeat wrote today that a spokesperson for Success Academy, New Tork City’s largest charter chain, resigned to protest “abusive” practices at the schools.

A spokesperson for New York City’s largest charter network resigned in protest, stating she can no longer defend Success Academy’s “racist and abusive practices” that are “detrimental to the emotional well being” of its students.

“I am resigning because I can no longer continue working for an organization that allows and rewards the systemic abuse of students, parents, and employees,” wrote Liz Baker, a Success spokesperson, in a resignation letter Tuesday.

“As the organization’s press associate, I no longer wish to defend Success Academy in response to any media inquiries,” she continued in the letter, which was obtained by Chalkbeat. “I do not believe that Success Academy has scholars’ best interests at heart, and I strongly believe that attending any Success Academy school is detrimental to the emotional wellbeing of children.”

The stunning resignation letter comes as the network has been besieged by complaints from employees, parents, and students about a culture that some argue is racist. Baker, who has worked at Success for about a year and four months, is one of the network’s most visible employees and was responsible for responding to reporters’ questions about the network.