You should probably read up on some history. They have played a pivotal role (as the antagonists) in the labor movement in the United States. They were involved in some of the largest insurrections after the Civil War. Their name is scattered throughout American history, and not for their good deeds.

They have an outright ominous reputation from their historical involvement in violently suppressing the labor movement in the US. Because they’re still corporate security, they’ve kept this reputation as corporate goons for hire.

I doubt most people do know the name. If you're not into westerns and haven't read about the history of the labor movement or of US law enforcement (and they sure as shit don't teach those things in most schools, so you'd have to find it out on your own) you could easily go through life without ever learning who they were/are.