Ted Kazinsky's manifesto. Ted is better known as the Unabomber but he was was motivated by some incredibly vivid projections about technology. It's easy to disagree with the kind of violence he engaged in, but it's hard to disagree with him about the consequences of industrialized society. I disagree with his conclusions, and certainly his actions, but it's hard to disagree with his reasoning which is one of my favorite things to encounter.

There's a great and bingeable TV series Manhunt which provides some dramatized background on him, but I'd recommend reading his work too.

I was reminded to recommend this by Hans Reiser's letter from prison.