State and describe at least four to five examples of milestones affecting the safety movement, from the 1800s until present. How has the role of organized labor played a significant role in the safety movement?

State and describe at least four to five examples of milestones affecting the safety movement, from the 1800s until present. How has the role of organized labor played a significant role in the safety movement? 

Your response should be at least 200 words in length. You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.