The American Metahuman Registration Act

In the 1950s, the House UnAmerican Activities Committee attempted to register metahumans and force them to submit to government authority out of fear that heroes could be secret communists. Most heroes refused, but those who didn’t were recruited by the government to bring those who disagreed to justice.

After McCarthy lost influence the government pulled back on their decision to register supers due to public outcry, and although registration acts have been floated again since, no attempts have been made to pass or enforce any.