The MGB reference article from the English Wikipedia on 24-Apr-2004
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MGB

MGB stood for Ministerstvo Gosudarstvennoi Bezopasnosti (Министерство государственной безопасности) - Ministry of State Security, in the USSR.

It was a predecessor of the KGB (secret police).

In March 1953, Lavrenty Beria united the MVD and MGB into one body, the MVD.