If you're curious about the debates in this comment section over just when the FBI became corrupt or political or conducting illegal surveillance or whatever, you should read Tim Wiener's history of the FBI, Enemies.
(It's available in audiobook form, if that is a format that works better for you these days.)
(It's available in audiobook form, if that is a format that works better for you these days.)
https://www.goodreads.com/book/show/13155934-enemies