By the 1850s, the Irish Catholics were a major presence in the police departments of large cities. In New York City in 1855, of the city's 1,149 policemen, 305 were natives of Ireland. The creation of a unified police force in Philadelphia opened the door for the Irish in that city. By 1860 in Chicago, 49 of the 107 on the police force were Irish. Chief O'Leary headed the police force in New Orleans and Malachi Fallon was chief of police of San Francisco.<ref>Potter p.530</ref> | By the 1850s, the Irish Catholics were a major presence in the police departments of large cities. In New York City in 1855, of the city's 1,149 policemen, 305 were natives of Ireland. The creation of a unified police force in Philadelphia opened the door for the Irish in that city. By 1860 in Chicago, 49 of the 107 on the police force were Irish. Chief O'Leary headed the police force in New Orleans and Malachi Fallon was chief of police of San Francisco.<ref>Potter p.530</ref> |