From 1900 until about 1950, "paper bag parties" are said to have taken place in neighborhoods of major American cities with a high concentration of African Americans. Many churches, fraternities, and nightclubs used the "brown paper bag" principle as a test for entrance. People at these organizations would take a brown paper bag and hold it against a person's skin. If a person was lighter than the bag, they were admitted. People whose skin was not lighter than a brown paper bag were denied entry.