The labeling theory argues that deviance is not an inherent characteristic of an act, but is instead defined through social processes and the reactions of others. When someone is labeled as deviant, this can influence how they view themselves and behave in the future. The key theorists who developed labeling theory in the 1950s-1960s were Howard Becker and Edwin Lemert. They explored how certain behaviors become defined as deviant through moral entrepreneurs and the distinction between primary and secondary deviance after being labeled. Labeling theory provided an innovative perspective in criminology by highlighting the role of social and governmental institutions in defining and creating deviance and crime.