Thousands of demonstrators gathered in downtown Los Angeles Saturday morning to march in support of rights for immigrants, with union members chanting "no human being is illegal." Many are outraged by a measure signed into law this week in Arizona requiring police to question anyone who could be an illegal immigrant and demand to see proof of citizenship, which critics say will lead to racial profiling. An illegal immigrant from Guatemala told the Los Angeles Times that he is scared when he drives home late at night. A Mexican-born demonstrator said she wanted to show that she and other immigrants are proud to be Americans and here to stay. Others said they were worried about laws similar to Arizona's coming to California, and the chaos they would create.