View of the Independent Boston Fusiliers on Parade on State Street in Boston, Massachusetts (1858)

View of the Independent Boston Fusiliers on parade on State Street in Boston, Massachusetts, c. 1858.

Source: Metropolitan Museum of Art.

Portraits of Members of the Police Department of Hartford, Connecticut (1868)

Portraits of members of the police department of Hartford, Connecticut, 1868. By Stuart. From the book Historical Sketch of the Police Service of Hartford, From 1636 to 1901.

Portrait of a Group of Unidentified Police Officers Armed With Bayoneted Muskets and Onlookers Posing in Front of the Metropolitan Hotel in New York City (1860′s)

Portrait of a group of unidentified police officers armed with bayoneted muskets and onlookers posing in front of the Metropolitan Hotel in New York City, c. 1860′s. By Silas A. Holmes and Charles DeForest Fredricks.

Source.

Lines of Policemen Protecting a Pro-Confederate Newspaper Offices From a Pro-Union Mob in San Francisco, California (1861)

Lines of policemen protecting a pro-Confederate newspaper from a pro-Union mob in San Francisco, California, c. 1861.

Source.

Policemen Aiming Their Revolvers During a Longshoremen's Strike in San Francisco

Policemen aiming their revolvers during a longshoremen's strike in San Francisco, c. 1930’s.

Source.