Marrone was the chief of the Civil Registry office in the municipality of Varese, Lombardy, during the Fascist Era and the Nazi occupation and issued hundreds of fake identity cards in order to save Jews and anti-fascists.
In 1931 he found a job in the town hall of Varese, so he moved to North Italy along with his wife Giuseppina and his four children Filippina, Salvatore, Dina and Domenico.
[3] In Varese he had a quick career and he soon became chief of the Civil Register office, then with 12 employees, and from that position he began providing fake documents to Jews and anti-fascists, allowing them to escape from the Nazi hunt.
However, an anonymous informant alerted authorities and he was arrested on 7 January 1944 and accused of collaborating with the Resistance, helping Jews escape, violation of official duties, and intelligence with the National Liberation Committee.
Despite this Calogero Marrone did not try to escape either because he promised to the Podestà Domenico Castelletti that he would have collaborated in the investigations concerning him and, above all, to protect his family from retaliations.