Against the Darkness is a video about coal mining in Montana.  Underground mining was dirty and very dangerous.  Many immigrants went to work in the mines while the coal mining companies controlled most other aspects in their lives – providing the housing but charging high rents or providing the general stores and making miners and their families shop there.  Miners faced several inherent dangers like explosions and black lung disease, but immigrants were hoping to make enough money to either go back home or buy land.