William McCloundy (born 1859 or 1860), also known as I.O.U. O'Brien, was an early 20th-century confidence trickster, from Asbury Park, New Jersey, who served a two-and-a-half-year prison term in Sing Sing for selling the Brooklyn Bridge to a tourist in 1901.
- Brooklyn Bridge#Cultural significance — other information about selling the Brooklyn Bridge
- George C. Parker
- "CONFIDENCE MAN JAILED.; McCloundy, Who Once Sold the Brooklyn Bridge, Faces Life Term". The New York Times. 1928-07-08. p. 21.
- Cohen, Gabriel (2005-11-27). "For You, Half Price". The New York Times.
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