Dan Berger, a University of Washington history professor, was sorting through three prison-issued trunks full of old papers when an unusual document, printed in dot matrix type, caught his eye. "It was computer code," he says. Amid the numbers and symbols stood recognizable words: violence, resentment, protest. And near the top, a simple declaration: "You are the warden of a maximum security institution. There are about 1,000 men confined in your prison.