By Brian Ellsworth MIAMI (Reuters) – Haitians are experiencing catastrophic hunger because of gangsters blockading a major fuel terminal, U.N. officials said on Friday, with more than 4 million facing acute food insecurity. A coalition of gangs has prevented the distribution of diesel and gasoline for over a month to protest a plan to cut fuel subsidies. Most transport is halted, with looting and gang shootouts becoming increasingly common. “We have for the first time a famine present in Haiti,” Ulrika Richardson, Resident and Humanitarian Coordinator for the U.N. system in Haiti, said in a te…