Third section
1855 - 1880
% complete
Okhrana
1881 - 1917
% complete
Cheka
1917 - 1922
% complete
GPU
1922 - 1923
% complete
OGPU
1923 - 1934
% complete
NKVD
1934 - 1943
% complete
NKGB
1943 - 1946
% complete
MGB
1946 - 1954
% complete
KGB
1954 - 1964
% complete
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