Subject is exactly prostitution
James O'Keefe and Hannah Giles posed as a pimp and a prostitute for an undercover camera investigation. Some low-level employees of the organization provided earnest answers to the pair's questions about avoiding detection and tax evasion, among other things. Fox News and Andrew Breitbart's Biggovernment.com (which was launched with these videos) helped to push the story beyond conservative media outlets and draw attention to the pair's findings. As a result, and after considerable media attention, ACORN was defunded by Congress.
W.T. Stead's sensational undercover series on "white slavery," child prostitution in and exported from London, featured the work of two women posing undercover as prostitutes and the purchase, by Stead himself, of a 13-year-old girl.
Charles Chapin, editor of The Chicago Times, hired Nell Cusak to investigate female working conditions in Chicago's factories. This 21-part series (published under the byline Nell Nelson) was based on the author's experience working undercover in several Chicago factories. Nelson named specific factories and managers she encountered, detailing the working conditions after spending only a brief time in each factory.