This document provides an overview of the concept of "moral panic" and its application to immigration in the United States. It begins with definitions of "moral panic" and traces its origins and use in academic literature from the 1830s to present day. Key theorists who developed understandings of moral panic, such as Stanley Cohen, Stuart Hall, and Jock Young, are discussed. Characteristics of moral panic, such as concern, hostility, consensus, disproportionality, and volatility are examined. The document then analyzes four waves of immigration to the U.S. between the 17th-19th centuries, arguing that each wave was accompanied by moral panic. It concludes by asserting the fourth wave continues to fuel moral panic