Columbia subject headings:
Azef, Evno Fishelevich, 1869-1918.
Revolutionaries--Russia.
Russia--History--Nicholas II, 1894-1917.
Harvard subject headings:
Azef, Evno Fishelevich, 1869-1918.
Nihilism.
Revolutionaries--Russia
Russia--History--Nicholas II, 1894-1917.
Russia--Politics and government--1801-1917.
Princeton subject headings: