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The American Protective League was an American 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.
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. President Wilson, despite some misgivings about their methods, deferred to the judgement of Attorney General Thomas Gregory and chose not to take any action to curtail their activities. The League disbanded in February of 1919.