Typical workplace conditions faced by factory workers in the 1800s includes 12-hour work days, few safety features or considerations, and little job security due to a large labor force. In fact, factory workers do not rest at all. The conditions were very bad during the Industrial Revolution in 1800s. Many workers died due to overfatigue.
He believed in making a new "perfect aryan race". Jews didn't fit that description, so he decided to kill them. He killed anybody really, but Jews were his main target as he was very anti-Semitic and blamed them for basically all of the worlds problems.
It promoted a strong national economy