Ferrara, March 28 - The attorney of a woman whose 18-year-old son died in police custody in 2005 said on Thursday that the family is suing the police union secretary and a senator for defamation following a protest outside the mother's office. A police protest on Wednesday outside city offices where Patrizia Moretti, the mother of Federico Aldrovandi, works sparked a national outcry from fellow officers, government officials and civil society alike. Two dozen COISP police union members staged the protest in solidarity with four officers convicted of Federico's manslaughter on September 25, 2005. The teenager, who was stopped on his way home after spending Saturday night with friends, was beaten to death. "The behavior of those people, who express solidarity with my son's murderers by seeking out Federico's friends and family, is inhumane. I am nauseated and disgusted", said Moretti, who works at Ferrara's city hall. Her attorney, Fabio Anselmo, said the family is suing COISP Secretary Franco Maccari and Senator Alberto Balboni (People of Freedom Party - PdL) for defamation following yesterday's demonstration, during which the cops and the MP accused the boy's mother of showing a photoshopped picture of her son's battered body. "All of us in the police should learn to say we're sorry. Apologies are a way to look within, even though we might not like what we see, to take responsibility for our guilt and to avoid repeating the same mistakes", SIAP and ANFP police unions said in a note Thursday. "Security forces must act in accordance with constitutional values or their actions become ones of barbarism and unthinkable arrogance. Our full gratitude and respect go out to Federico Aldrovandi's mother", progressive association Democratic Magistrature said in a note. "Yesterday in Parliament everyone stood up in solidarity with Patrizia Moretti", Senate President Pietro Grasso (Democratic Party - PD) reminded the public via Twitter. "I fully support Interior Minister Anna Maria Cancellieri's condemnation of yesterday's shameful COISP protest. I want to express my solidarity with Federico Aldrovandi's mother", said MP Renato Brunetta, who is the PdL caucus leader in the lower house. "While it is legitimate to express solidarity and esprit de corps, everyone must respect the judiciary's decisions, beginning with those who represent the institutions", commented Bologna state prosecutor Valter Giovannini. "Can someone stop this institutional stalking of Patrizia Moretti?" Ilaria Cucchi, Lucia Uva and Domenica Ferrulli, who also lost close relatives to police brutality, said in an open letter. Articolo21 freedom of speech association and ARCI civil rights association also expressed their solidarity with Moretti, who called on cops and civilians alike to join her in a sit-in to honor her son in Piazza Savonarola tomorrow.