Tankies are far left Marxists/Communists that are so anti- USA/West that they gladly defend almost anything that opposes the USA. Even authoritarian states like Russia and China. To be clear not every Communist is a Tankie through. And if you critizises on of this countries for horrible stuff, the Tankies will see you automatically as a USA chill. Because, from my online interactions with them, they see the world in black and white.