American Protective League
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The American Protective League was a World War I-era private organization that along with federal police like the Bureau of Investigation worked in support of the anti German Empire movement and against anti-war citizens and organizations.
Formed by wealthy Chicago businessmen, at its height of power the APL had 250,000 members in 600 cities. Officially condoned by the Attorney General, the APL support to the Bureau of Investigation, the precursor to the FBI.
A private organization with no legal authority, APL members acted as vigilantes, allegedly violating the civil liberties of American citizens. The APL has been accused of having illegally detained citizens associated with progressive, labor, and pacifist movements.
In 1918, APL documents showed that 10% of its efforts (the largest of any category) were focused on disrupting the activities of the I.W.W. "Wobblies" radical union movement. The APL burgled, vandalized, and harassed I.W.W. members and their offices. These activities were illegal, yet supported by the Wilson administration and the American establishment.