A day after the most contentious provision of Arizona's immigration law took effect, rallies are taking place around Phoenix to protest the law that civil rights activists contend will lead to systematic racial profiling.

More than three dozen activists stood outside a U.S. Immigration and Customs Enforcement building along a busy thoroughfare Wednesday evening. They chanted: "No papers, no fear."

Carlos Garcia is an organizer with the immigrant rights group the Puente Movement. He says the strategy is to urge people to not cooperate with immigration enforcement efforts - whether they're in the country legally or not.

U.S. District Judge Susan Bolton ruled Tuesday that police can immediately start enforcing Arizona's so-called "show me your papers" provision. It requires officers, while enforcing other laws, to question the immigration status of those suspected of being in the country illegally.