 In 1952, the year Thorazine, the first anti-psychotic was introduced, 2,331 patients were served by 509 staff.The Haskell building, which still serves as an office for the Massachusetts Department of Mental Health, was added in 1959.On January 6, 1978 the United States District Court approved the Brewster Consent Decree, which made clear a patient's constitutional right to treatment in the least restrictive environment possible.