There were many unsafe working conditions in the factories. Specifically,

The ones that require the owners to spend a lot of money to fix.

Explanation:

The Owners of the workplace will always think twice before investing in workplace safety. They wanted to cut down as much expense as possible in order to maximize their profit.

As a result, many of the precautions that needed to ensure worker's safety were neglected. Prior to the Creation of OSHA, all the accidents that occurred because of this neglect were not the employer's responsibility. They blamed the workers for not being careful. After OSHA was created, employers were held accountable to the safety of their workplace. This force them to pay attention to the safety precautions.