As Newark cops yesterday continued hunting for three people suspected in a grisly schoolyard massacre there, residents said several of the men were part of a notorious street gang. It also emerged that one of the fugitives, Rodolfo Godinez, obtained a green card in 2001 and was allowed to stay in the United States despite later robbery and assault arrests, immigration authorities said yesterday.Godinez pleaded guilty to lesser charges. His fellow fugitives include his 16-year-old brother and another youth, both of whom attended Mount Vernon School, the scene of the Aug. 4 triple slaying. Recently, Godinez's brother and another youth...