How did the work of Pinkerton in the late 19th century set the standard for a wide range of skills to be associated with the security industry? Check all that apply. He used and trained others in investigative

How did the work of Pinkerton in the late 19th century set the standard for a wide range of skills to be associated with the security industry? Check all that apply.

He used and trained others in investigative skills for apprehending criminals.
He counseled General Grant and took over his lead of the Union army.
He introduced the use of intelligence factors, using them to foi a plot against President Lincoln
He devised strategies for bodyguards to surround a person as a key method for keeping them safe.

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