Overview: 2012/04/30 Headlines: Labor, Occupy Prepare for May Day Protests; Report: Banks, Police Share Occupy Monitoring; Hundreds March on New York Stock Exchange; Twin Bombings Hit Syrian City of Idlib; Bahrain Orders Retrial for 21 Activists; Egyptian Protester Killed in Anti-Military Protest; Chinese Activist Under U.S. Protection After Escaping House Arrest; Ex-Israeli Spy Chief: Iran Threats Driven by "Messianic" Israeli Leadership; British Grocer Expands Israeli Settlement Boycott; Tens of Thousands Protest Austerity as Spain Falls into Recession; Probe: No Intelligence Gains Through Torture Techniques; Ex-CIA Interrogator: Obama Policy is to "Kill All Prisoners"; Judge Rejects Bail Hike for Zimmerman; Thousands of Indigenous People Attend Gathering of Nations; Obama Mocks GOP Challengers at White House Correspondents' Dinner; L.A. Marks 20 Years Since Rodney King Riots;$