Rights groups accuse Angola of crackdown after activist jailed

By Herculano Coroado LUANDA (Reuters) - Rights groups accused Angola's government on Wednesday of using the legal system to crack down on critics, after an activist was jailed for six years on charges of stirring rebellion. Jose Marcos Mavungo was found guilty on Monday of an "attack on the sovereignty of the Angolan state" as prosecutors accused him of trying to encourage his restive oil-producing home region of Cabinda to fight for independence. "It was a political judgement ... The trial is a