The Institute for the Study of Totalitarian Regimes (Czech: Ústav pro studium totalitních režimů or ÚSTR) is a Czech government agency and research institute. It was founded by the Czech government in 2007 and is situated at Siwiecova street, Prague-Žižkov (the street is named after Ryszard Siwiec). Its purpose is to gather, analyse and make accessible documents from the Nazi and Communist totalitarian regimes. Its Security Services Archive also has documents from the former communist secret police, the StB or State Security. The institute is a founding member organisation of the Platform of European Memory and Conscience, and hosts its secretariat. Source: Wikipedia (en)