Irregular troops engaged in guerrilla warfare, often behind enemy lines. During World War II, this term was applied to resistance fighters in Nazi-occupied countries.

A major piece of antisemitic propaganda, compiled at the turn of the century by members of the Russian Secret Police. Essentially adapted from a nineteenth century French polemical satire directed against Emperor Napoleon III, substituting Jewish leaders, the Protocols maintained that Jews were plotting world dominion by setting Christian against Christian, corrupting Christian morals and attempting to destroy the economic and political viability of the West. It gained great popularity after World War I and was translated into many languages, encouraging antisemitism in France, Germany, Great Britain, and the United States. Long repudiated as an absurd and hateful lie, the book currently has been reprinted and is widely distributed by Neo-Nazis and others who are committed to the destruction of the State of Israel.