I Ask This Every Once In A While

So, time to ask.

Does anyone know where/what AntiFa is? The reason why I ask, is that so many people blame AntiFa for everything from riots in Seattle/Portland, to the price of rice in China.

The Administration is so certain, they sent Federal Troops, to arrest people randomly on the streets of Seattle and Portland, and the Trump supporters blame everything on it, so they must know what/where AntiFa is.

I would love to know.