The Progressives.
Progressivism aimed to improve society by various reforms, and improving dangerous working conditions was a key concern during the Progressive Era (roughly the first two decades of the 20th century). Progressives used methods like settlement houses to try to provide better social care for poor urban workers. The labor union movement was also a part of the Progressive agenda.
The two main obstacles that United Sates mine workers faced were 1) Very dangerous conditions, in which many people lost their lives, and 2) A lack of good and reliable pay for their labor.
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He just wanted to give peace while the others wanted punishment
