In many cases, progressive initiatives crossed over from social reform into social control. Convinced that the “immorality” of the poor was the cause of social disorder, some reformers sought to impose middle-class standards of behavior and morality on the lower classes. As with other forms of progressivism, progressives interested in social control were driven by a variety of motives. However, regardless of their motives, efforts to prohibit alcohol, fight prostitution, and combat juvenile delinquency often involved attempts to repress and control the poor. Some social control progressives went even further in their effort to impose their own morality, calling for restrictions on immigration, particularly from southern and eastern Europe and Asia. Anti-immigration advocates viewed cultural and religious differences as a threat and sought to prevent such people from becoming part of American society in the first place.