Reporters have worked as guards or gotten themselves arrested -- sometimes with the aid of authorities and sometimes without -- to investigate conditions inside prisons and jails.
In efforts to get inside the fold, reporters have fellow-traveled with religious groups, posing as members or prospective recruits.
Across the world, journalists have used undercover techniques to expose individual predators and as well as major sex crime rings.
Reporter efforts to get inside the world of lobbyists, both on Capitol Hill and in the statehouses.
Redpath, Olcott, Richardson and Thomson all went South for the New York Tribune and produced reporting undercover in the run-up to the Civil War.
The work of groups such as James O'Keefe's Project Veritas and Lila Rose's LiveAction and their undercover operations.
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