Servizio per le Informazioni e la Sicurezza Democratica (Intelligence and Democratic Security Service), was the domestic intelligence agency of Italy.
With the reform of the Italian Intelligence Services approved on 1 August 2007, SISDE was replaced by AISI.
Since the end of World War II, Italian intelligence agencies have been reorganized many times in an attempt to increase their effectiveness and bring them more fully under civilian control.
The agency was established as part of a broader reform of the Italian intelligence community, which represented the latest in a long string of government attempts to effectively manage Italy's intelligence agencies.
In 1977, with Legislative Act n.801 of 24/10/1977, this came after a former chief of SID, Vito Miceli, was arrested for "conspiration against the State" (See Golpe Borghese), and the intelligence agencies were reorganized in a democratic attempt. This re-organization mainly consisted of: