Pinkertons could make "citizen's arrests". They weren't encumbered with jurisdictions or the rights of the accused since they weren't government officials. Think "Dog the bounty hunter" minus the mega-mullet.
Yes
Yes. Agents working for secret service organisations such as the United State's CIA and the United Kingdoms MI6 have the legal power to arrest anybody on their home soil and potential threats (ie terrorists) overseas for the defence of their country.
Hell yeah. They can arrest the president if the circumstances are legitimate.
Jim Pinkerton's birth name is James P. Pinkerton.
Isabella McQueen Pinkerton born about 1786 and William Pinkerton born about 1771
The cast of Nat Pinkerton contre Nat Pinkerton - 1914 includes: Pierre Bressol
Pinkerton Consulting and Investigations
John Pinkerton was born in 1758.
John Pinkerton died in 1826.
David Pinkerton was born in 1836.
David Pinkerton died in 1906.
Pinkerton Academy was created in 1815.