Here in New York, members of the local rights group Movement for Justice in El Barrio rallied at City Hall Sunday to launch an international campaign against gentrification. The residents say they’re fighting poor conditions at dozens of East Harlem buildings recently purchased by the British investment firm Dawnay-Day Group. Movement for Justice in El Barrio members say they plan to work with other tenants-rights communities facing similar struggles worldwide, including in Spain, England and Mexico.