Well, The real Pinkertons apparently filed a lawsuit against a character used in Red Dead Redemption 2 which happens to be The Pinkertons as well.

Pinkertons — now owned by Swedish security company Securitas AB and called Pinkerton Consulting & Investigations – sent a cease-and-desist notice to Take-Two last month, asking for either a single payment or a royalty arrangement for Red Dead 2’s use of the term “Pinkerton” throughout its story.

Source: Polygon

Rockstar says that the use of the word is justified for historical accuracy of the game.

But I’m still surprised that Kataku didn’t know The Pinkertons existed with their article titled The Pinkertons Are Still Around, Suing Over Red Dead Redemption 2 as well as Quartz The Pinkertons still exist, and they’re coming for video game royalties?. Who knows…