I think the largest and most significant action that took place was the "illegal" use of vaccines. Specifically, he mentions the Edmonson B vaccine. He says that vaccine alone killed hundreds possibly thousands and that Chagnon had no right to give these vaccines to these people. They did not have major sicknesses before Chagnon arrived. As a result, measles was an epidemic that spread like a wildfire and Tierney blames that on Chagnon. Also, another interesting part about the reading was the fact that Chagnon made these people almost into movie characters. He made the Yanomami start fights to try and film it on camera which is messed up. Additionally, these fights that began as just simple footage actually caused tension and eventually major conflict within the community.