Steampunk National Security Character Type Help Needed

[Icelander]

I've forgotten to mention a staple character, the tough-looking chaps in suits and bowler hat. They have the income to dress middle-class, due to their loyal service to their betters and their occasionally useful ruthless ferocity, but their lower-class origins are betrayed in their speech and their fashion sense.

As far as I can determine, an actual class of people who handled security, violence and intimidation on behalf of various powerful people in 19th century Britain, in and out of government. Sort of like successful criminals, smart enough not to commit crimes without the backing of a patron.