 Though Pinkerton considered himself pro-labor, he opposed strikes and distrusted labor unions.Allan Pinkerton was so famous that for decades after his death, his surname was a slang term for a private eye.The "Mr. Pinkerton" novels, by American mystery writer Zenith Jones Brown (under the pseudonym David Frome), were about Welsh-born amateur detective Evan Pinkerton and may have been inspired by the slang term.