What Exactly Is A Red/Brown Alliance and is the US at risk of one?

Basically all I can think of for Red/Brown are the liberal members of the Boogaloos, Tucker on Ukraine but I'm not up to speed on this potential problematic alliance thst seems class reductionist. What are your takes? Is it because anti-govt leftists will search for allies. Do y'all consider Ancaps as Brownies. The biggest Red/Brown alliance I see is the toilet bowl after taco Tuesday