During World War II, he was head of the Assisi network (along with the Bishop Giuseppe Placido Nicolini and Father Rufino Nikachi), who worked in order to save Jews.
He appointed Aldo to take charge of the operation, and gave him the task of arranging hiding spots in all the monasteries in the city.
The Assisi Network brought Jews to the San Quirico monastery in order to receive their fake documents.
Gino Bartali (a champion road cyclist who was also recognized as a Righteous Among The Nations) was another persona who helped the operation, by delivering forged documents to Assisi on his bicycle.
[4] At that time, in Assisi there were several spies who took pictures of Brunacci in order to get proof of him smuggling the Jews, and this led to the Fascist police capturing him.