across East Germany starting in Erfurt on the same day. The prison closed in the early 1990s. The state of Mecklenburg-Vorpommern took ownership of it in 1998, and the memorial site and museum were established in 1999. An extensive restoration of the site began in December 2018. Stasi officers after the reunification Recruitment by Russian companies Former Stasi agent Matthias Warnig (codename "Arthur") is currently the head of Nord Stream. Investigations have revealed that some key Gazprom Germania managers are former Stasi agents. Lobbying Former Stasi officers continue to be politically active via the Gesellschaft zur Rechtlichen und Humanitären Unterstützung (GRH, Society for Legal and Humanitarian Support). Former high-ranking officers and employees of the Stasi, including the last Stasi director, Wolfgang Schwanitz, make up the majority of the organization's members, and it receives support from the German Communist Party, among others. The impetus for the establishment of the GRH was provided by the criminal charges filed against the Stasi in the early 1990s. The GRH, decrying the charges as "victor's justice", called for them to be dropped. Today the group provides an alternative if a somewhat utopian voice in the public debate on the GDR's legacy. It calls for the closure of the Berlin-Hohenschönhausen Memorial and can be a vocal presence at memorial services and public events. In March 2006 in Berlin, GRH members disrupted a museum event; a political scandal ensued when the Berlin Senator (Minister) of Culture refused to confront them. Behind the scenes, the GRH also lobbies people and institutions promoting opposing viewpoints. For example, in March 2006, the Berlin Senator for Education received a letter from a GRH member and former Stasi officer attacking the Museum for promoting "falsehoods, anti-communist agitation and psychological terror against minors". Similar letters have also been received by schools organizing field trips to the museum. Stasi agents Christel Boom Gabriele Gast Günter Guillaume Karl-Heinz Kurras Lilli Pöttrich Rainer Rupp Hans Sommer Werner Teske Alleged informants Vic Allen, University of Leeds professor. Helmut Aris, co-founder of the Association of Jewish Communities in the GDR. Horst Bartel, Marxist–Leninist historian. Almuth Beck, SED/PDS politician. Jutta Braband, civil rights activist and PDS politician. Siegfried Brietzke, three-time gold medal-winning Olympic rower. Georg Buschner, football coach at FC Carl Zeiss Jena and the East Germany national football team. Buschner was listed as an informant under the codename Georg. Harald Czudaj, bobsledder. Richard Clements, adviser to Neil Kinnock.