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The first organized baseball team, founded by Alexander Cartwright in 1845. Played under a set of rules known as "The Knickerbocker Rules", historically similar to the game today.
An average amateur team in the 1850s, after professionalism entered the sport by the 1870 season, Union refused to enter the new National Association of Professional Base Ball Players.
Known for originating the "Brooklyn-style" baseball cap, precursor to the modern cap. Were one of the first baseball clubs to undertake a long-distance tour to compete outside their home region.
Team disbanded after the National Association folded following the 1875 season.
After its only year in the National Association, the franchise folded following the 1872 season.