At around the time of Mazzucchelli's release the secret CLN meetings in the riverside "Buco" basement room came to an end, due to the increasing risk of detection in the municipality. Mazzucchelli returned to the unit and took a lead in removing this and other groups with which they were networked out of the city and into the mountains on a more permanent basis. The mountains had also become less safe, however, due to the appearance of a German armoured division under the command of SS-Sturmbannführer Walter Reder, still aged only 28, and infamous after the war on account of his leadership role in various mass killings including, locally, the massacre of more than 500 villagers and refugees at Sant'Anna di Stazzema. Mazzucchelli now reorganised his unit and renamed it as the "formazione autonoma Lucetti" - more frequently identified more simply as the "Gino Lucetti brigade". The name was adopted to honour the recently deceased anti-fascist hero from Carrara, Gino Lucetti, who in 1926 had attempted to assassinate the leader using a roadside bomb by the Porta Pia in 1926.