[Drfamiliarhate]

Maybe The Bonus Army in 1932, though far less intensified in terms of casualties. Many labor movements and strikes in 19th and early 21th century also led to death of up to 100 by law enforcement, state troops or private guards hired by business owner. Most recent case I can think of is the Kent University Shooting in which national guard killed 4 students protesting Vietnam War. Some witnesses said these soliders was not self-defensing but deliberately shot at the crowd