Numerous complaints are made about immigrant day laborers. These include loitering, noise, crime and rushing cars of potential employers in parking lots. Cities and counties have tried a variety of solutions with varied success. Some municipalities and communities have supported workers' efforts to organize themselves into democratically run workers' centers, designated areas, and organizations to defend workers' rights in general. Workers' Centers of this kind date back at least 18 years to Los Angeles. Other municipalities have targeted day labor sites for aggressive enforcement of immigration laws.