Croatian prelate and martyr Bl. Alojzije Cardinal Stepinac is a controversial figure, putting it mildly. He is accused of cooperating with the pro-Nazi Ustaše government during World War II and of being hostile to the Jews and Eastern Orthodox. Given the concerns, Pope Francis has called for a commission to study whether his cause for canonization should proceed. He recently named the Catholic members. You can read more here.
For what it’s worth, Louis Brier, late president of the American Association of Jews, said at the time of Stepinac’s show trial that “This great man [Stepinac] was tried as a collaborator of Nazism. We protest this slander. He has always been a sincere friend of Jews and was not hiding this even in times of cruel persecution under the regime of Hitler and his followers. He was the greatest defender of the persecuted Jews.”