Why did Progressive reformers want to add a referendum, recall, and initiative to the political process?

In 1911, California voters approved the constitutional processes of initiative, referendum, and recall. Through these processes, voters can adopt a change in law (an initiative), disapprove a law passed by the Legislature (a referendum), or remove an elected official from office (a recall).

They mowt likely lived in caves or maybe rock houses,i know they are similar but its all i know