When someone is behaving badly and needs to be admonished, we often use the phrase "read riot act to." However, there are many synonyms that can be used to express the same sentiment. Some alternative phrases include "give a stern talking to," "reprimand severely," "chew out," "scold," "rebuke," "castigate," and "berate." Each of these phrases indicates a strong disapproval of the person's actions and a desire to correct their behavior. Ultimately, the choice of phrasing will depend on the severity of the situation and the relationship between the person delivering the admonishment and the person being reprimanded.