https://www.vice.com/en_us/article/akze3k/police-intelligence-antifa-conspiracy-theory

In an interagency communication sent to local police departments earlier this month, an official with a Washington-state fusion center told cops to look out for members of Antifa traveling to their cities to potentially riot. These claims are unsubstantiated and have largely been debunked across the country.

The news signals how what amounts to a conspiracy theory has permeated through local communities, right through federal law enforcement, and up to the President. Antifa is not an official, centralized group, and instead a general movement of activists who have anti-fasicst worldviews, although President Trump has expressed willingness to designate it as a terrorist organization.