This is a concise and well-presented history of the Proud Boys, their leaders, their tactics, and their impact in promoting increasing violence in political demonstrations and rallies in the US. No one would accuse Mr. Campbell of providing a balanced and unbiased perspective of the Proud Boys, and he often paints other right wing extremist groups (e.g., Three Percenters, Oath Keepers) with a broadly overlapping brush that inadequately respects their training and commitment to armed violence and their resistance to the Federal Government. However, the book describes the Proud Boy’s formation, unstable leadership and commitment to violence in support of Donald Trump with the tacit support and approval of the Republican Party.