Thomson and Thompson

 From Wikipedia:

The detectives were in part based on ... a picture of two mustachioed, bowler-hatted, formally dressed detectives who were featured on the cover of the Le Miroir edition of 2 March 1919. They were shown escorting Emile Cottin, who had attacked Georges Clemenceau—one detective was handcuffed to the man while the other was holding both umbrellas

I was curious about this image, and chased it up. I was not disappointed:

Formidable! For extra trivia points, Cottin the would-be assassin was known as: ‘Milou’. There's a thesis in this, I feel ...