Daniel O'Leary
American mobster
About Daniel O'Leary
Lived 1900 – 1928 (aged 28).
Daniel J. "Danny" O'Leary (January 30, 1900 - August 15, 1928) was an Irish Philadelphia mobster involved in bootlegging who, a rival of Maxie "Boo Boo" Hoff throughout Prohibition, would struggle for dominance among the many gangs of Philadelphia's underworld. His death, only six days after his participation in the gangland slaying of Hugh "Hughie" McLoon, would mark the beginning of gang wars during the late 1920s eventually leading to a Special August Grand Jury investigating corruption and influence of organized crime in the city.
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Important facts
Contemporaries
People whose lives overlapped Daniel O'Leary's
Frequently asked questions
Who was Daniel O'Leary?
American mobster
When was Daniel O'Leary born?
Daniel O'Leary was born on 30 January 1900.
When did Daniel O'Leary die?
Daniel O'Leary died on 15 August 1928.
Sources & further reading
· DBpedia: Daniel O'Leary (mobster)
Cite this page
APA: Biography.guide. (2026). Daniel O'Leary. https://biography.guide/daniel-o-leary/
MLA: "Daniel O'Leary." Biography.guide, https://biography.guide/daniel-o-leary/.
Chicago: "Daniel O'Leary." Biography.guide. https://biography.guide/daniel-o-leary/.
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