There's a couple of great books on the militarization of the police that I'd highly recommend:

Battlefield America: The War On The American People by John W. Whitehead and Rise of the Warrior Cop: The Militarization of America's Police Forces by Radley Balko

If you live in a small town or nice community, it's easy to be insulated from what's happening with the police in America. There's also a drive to push people on the right to overlook violations of the constitution in the name of "safety" and upholding "law and order". Really enlightening and scary stuff, I recommend both to everyone.

You could probably grab the ebooks or audiobooks from b-ok.cc audiobookbay.nl or torrentz2.is though I recommend supporting the authors if you can.