Media, and not just Fox News, has been sending out a view of what's going on in cities like Portland that doesn't always fit the view on the ground. There are many people out there unconditionally supporting police forces and the use of federal cops regardless of laws or even the science of what good policing looks like. 

UPDATE: Seattle has voted to partially defund their police force effective during the 2020 budget. In response the Chief of SPD resigned this morning. The contempt filing against the City of Seattle has resulted in Seattle agreeing to no longer target press, medics, and legal observers.  
While federal police are no longer directly confronting protesters in Portland they are still on the ground there. 

RESEARCH:

A Constitutional Crisis in Portland

New York Legislature to Take on Long Detentions by NYPD

The Air Force Spy Plane Over Portland

The Air Force Spy Plain Used Against Protesters The Air Force Spy Plane Over Portland

Baltimore Aerial Surveillance Lawsuit Lawsuit Aims to Stop Baltimore Police From Using War-Zone Surveillance System to Spy on Residents

How Policing turns protests violent  (And Why it happens) New Directions in Protest Policing

Easier to read summary of the study https://www.portlandmercury.com/blogtown/2020/06/05/28509410/research-says-violent-cops-cause-violent-protests?fbclid=IwAR1RGHh82ElzerC_c0w7BMwt85I-Jd4WSjRK7xOoQxFc1H3rrFh08WpLtLU

Collecting Intelligence on Journalists who report on protests

DHS compiled ‘intelligence reports’ on journalists who published leaked documents

Attacking journalists in Louisville
George Floyd protests: Louisville law enforcement shoots reporter with pepper bullets

Protesters being Released in Portland have to agree to not protest further
https://www.newsweek.com/jailed-portland-protesters-must-agree-stop-going-protests-freed-1521178?fbclid=IwAR3wX3fQ4FvTgV4fypj7HmybS35XBzO4ujVINkXWkZgyVWgRkyLVRNX5JWU

Documentary “The Fight” about the multiple fronts the ACLU is working on.
The Fight