The former United Nations High Commissioner for Human Rights told FIFA she could no longer serve on its governance committee because its officials "violate the norms and standards of good conduct."
South African judge Navi Pillay made the criticism in her resignation email to FIFA general secretary Fatma Samoura, also a former UN official, on May 17.
The email, now published on the website of the Digital, Culture, Media and Sport (DCMS) committee, confirms Pillay's decision to quit the governance committee following the abrupt removal of its chairman, Miguel Maduro, a week earlier.
Having already told Samoura of her "dissatisfaction" with the decision on the phone, Pillay wrote that they had both completed an online course on FIFA's ethics code which required them to report cases of "improper interference" or the "exercise of influence or pressure.