Overview: 2010/05/03 Headlines: May Day Rallies Held to Protest Arizona's Anti-Immigrant Law; Major League Baseball Union Urges Arizona to Repeal Law; Fishing Banned in Gulf Due to Massive Oil Spill; Halliburton's Role in Oil Rig Explosion Probed; Obama Vows to Help Gulf Region; EU and IMF Agree to $146 Billion Bailout of Greece; Pakistani Man Convicted for Role in 2008 Mumbai Attacks; New York Investigate Failed Times Square Car Bombing; Civilian Casualties Soar in Afghanistan; Student Strike Shuts Down University of Puerto Rico; Anesthesiologists Face Censure for Participating in Executions; United and Continental to Merge; Bolivia Nationalizes Four Power Companies; Maoists in Nepal Launch General Strike; Second Brazilian Rancher Convicted in Murder of American Nun; Nuclear Non-Proliferation Treaty Conference Opens in New York; Bill Moyers Signs Off From PBS Show