A form of demonstration used by african americans to protest discrimination, in which the protesters sit down in a segregated business and refuse to leave until they are served.

The answer is sit-in.

Sit-in, also known as sit-down is a form of demonstration used by African-Americans to protest discrimination. In sit-in, protesters sit down in a segregated business and refused to leave until they were served. One or more people occupies a business or a place where they would do their protest.