He also encouraged the formation and efforts of Sodalitium Pianum (or League of Pius V), an anti-Modernist network of informants, which was seen negatively by many people, due to its accusations of heresy against people on the flimsiest evidence.
Dia juga mendorong pembentukan dan upaya Sodalitium Pianum (atau Liga Pius V), sebuah jaringan informan anti-Modernis, yang dipandang negatif oleh banyak orang karena tuduhan bid'ah terhadap orang-orang di bukti paling tipis.