He gained international popularity in 2021, when he renamed four streets in Budapest to "Free Hong Kong Street", "Uyghur Martyrs Street", "Dalai Lama Street" and "Bishop Xie Shiguang Street" in protest of the Hungarian government's choice to open a branch of the Fudan University in Budapest, which in 2019 changed its statute, removing the phrase "academic independence and freedom of thought" and including "commitment to follow the leadership of the Communist Party", thus being considered by Karácsony and the thousands of Hungarian citizens who protested against the opening of the Chinese university as a sign of an excessive expansion of Chinese influence in Hungary.