Perhaps not, but you've surely seen a few of their many products: 
Yeah, I would have never joined up with that Tea Party movement if it weren’t for the Koch brothers. Except I never heard of the Koch brothers.
I happened to be watching CNBC live when Rick Santelli went on his famous rant, to which I heartily hooray-ed. That was it until I saw a vid on FR of a bunch of people marching with signs behind a couple of people wearing colonial garb, playing a flute, with one holding a bale of — what was it? — oh, tea to throw into a local body of water.
Never looked back. Never heard of the Koch brothers.
Perhaps not, but you've surely seen a few of their many products: