President Donald Trump has issued an executive order designating antifa as a domestic terrorist organization. Antifa, short for “anti-fascists,” is an umbrella term for far-left-leaning militant groups and is not a singular entity. It consists of groups that resist fascists and neo-Nazis, especially at demonstrations. The order did not specify how the administration would label what is effectively a decentralized movement as a domestic terrorist organization. Trump had said last week on social media that he would designate antifa as a “major terrorist organization.”