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ineedhelpreallybad23
They spied for the Union Army during the Civil War. Allan Pinkerton was a staunch abolitionist and Union man, and during the Civil War, he organized a secret intelligence service for General George B. McClellan's Army of the Potomac.
mewmew127

Answer:

Early 21st Century businessmen

Explanation:

they used them in order to infiltrate whoever was with the strike and to intimidate workers

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