Mark Klein, known for exposing the NSA's mass surveillance through AT&T, has passed away. His revelations about the unlawful surveillance practices began a significant discussion around privacy and government oversight. Many commenters reflect on Klein's character and the moral strength he exhibited in whistleblowing. Although he was overshadowed by Edward Snowden in the public eye, those familiar with his work see him as a pivotal figure for privacy advocacy. His death has prompted renewed conversations about government surveillance practices and the continuous debate over balancing security and privacy.