CliffsNotes Word of the Week

myrmidon
(mûr' mə dän')

An unquestioning follower or subordinate.

Here, "myrmidons of Justice" refer to policemen:

When the day came round for my return to the scene of the deed of violence, my terrors reached their height. Whether myrmidons of Justice, specially sent down from London, would be lying in ambush behind the gate?

From Charles Dickens's Great Expectations.