Exposure to propaganda can lead to biased attitudes that change the way people speak and act, sometimes without their conscious awareness. Propaganda has historically contributed to systemic discrimination, bias-motivated violence, and even genocide. By comparing historic and contemporary propaganda, students come to understand how people's values can be hijacked through persuasive appeals that activate strong emotions, use oversimplified information, and attack opponents. Teaching students how to identify propaganda is an essential life skill in combating dehumanizing language, ideas, and actions in all its forms. The activities in this article can guide students to confront historic examples of harmful propaganda and help them understand the problem and danger of modern stereotypes.