Ewa Kłobukowska
Kłobukowska set three world records, one in the 100 m (11.1 s, 9 July 1965 in Prague) and two in the 4×100 m relay (44.2 s, 13 September 1964, Łódź and 43.6 s, 21 October 1964, Tokyo).[3] Despite these successes and laurels, her records were annulled by the International Association of Athletics Federations (IAAF) after a sex identification test in 1967 wrongly labeled her as not female.[9] The sex test used for European Cup women's track and field competition in Kyiv in 1967 wrongly identified her as not female, and Kłobukowska was subsequently banned from competing in professional sports.[13][14] The Polish Olympic Committee has stated that athletic federations from the Soviet Union and East Germany targeted Kłobukowska for sporting reasons.[15] Kłobukowska's humiliation led to a change in the sex verification policies by the International Olympic Committee, which from then on kept test results secret.