In what way did the upward pressure of social movements influence policymaking by elites around the turn of the twentieth century?

Question

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Journalistic attention to unhygienic consumer products prompted new government regulations. The muckraking journalism of the Progressive Era exposed many unsafe and unhealthy practices in American industry, including the food and medicine industries. This led to the passage of several key pieces of legislation, including the Pure Food and Drug Act of 1906, which aimed to protect consumers from harmful products. This demonstrates how upward pressure from social movements can influence policymaking by elites.

In What Way Did the Upward Pressure of Social Movements