This document discusses saboteurs and how they can undermine projects. It defines a saboteur as someone who wants a project to fail, change direction, or be undermined. Saboteurs are effective if their persistence and consistency are allowed to influence others over time. Their impact on projects can include preventing clear communication about needed changes and causing delays. The document provides types of saboteurs and suggests approaches to dealing with them such as ignoring low-impact saboteurs but closely monitoring or "turning" more influential ones. It concludes that saboteurs should not be ignored but that their motivations need to be understood so the issues they raise can be addressed.