Rome, May 31 - Italian police were investigating on Friday after Lazio Governor Nicola Zingaretti received a threatening letter claiming to be from the Red Brigades left-wing terrorist group. A person who opened the letter and anther who touched it have been taken to hospital as a precautionary measure as the envelope contained suspect powder. The Red Brigades were responsible for numerous acts of terror during Italy's 'years of lead' of political violence in the 1970s and 1980s. They kidnapped and then murdered former Italian premier Aldo Moro in 1978. Various groups have tried to resurrect the Red Brigades, including the so-called new Red Brigades, who killed government advisors Massimo D'Antona in 1999 and Marco Biagi in 2002 but were thought to be defunct after their leaders were arrested. The letter sent to Zingaretti had the Red Brigades' five-star symbol, but it was written by hand. The terrorist group usually typed its letters.