There were all sorts of reforms going on during the Progressive Era. This was a time when there were reforms having to do with such things as economics, politics, and society.
In economics, a major reform was "trustbusting." This was meant to break up monopolies and reduce the power of big business. There were also reforms such as the passage of the Pure Food and Drug Act. This was meant to prevent businesses from harming their customers.
Politically, a major effort was made to reduce corruption. There was the implementation of recalls and initiatives and the secret ballot in many cities and states. Senators came to be elected by popular vote.
In terms of society, the main reforms were aimed at getting the poor and immigrants to behave more like the middle class. The most important of these reforms was Prohibition.