Can you name all the The Marx Brothers without cheating

That means don't use the internet to answer

@HumanEarth am I missing one? 🤔

I'm pretty sure those are two of them. Karl came up with a specific flavor of communism and Onya invented the starting pistol. His name is still called before every race to honor this ground breaking work.

HumanEarth · F

I know he only did vaudeville till WW1 then went to fight in WW1 then after the war into the business side of the act. That's your hint