BY BULATLAT The crackdown against Southern Tagalog activists continues as two more union leaders were arrested this morning. Arnaldo Seminiano and Sonny Gum-o, both organizers of Ilaw-Buklod ng Manggagawa (IBM), were arrested by four policemen around 10 a.m. at Manggahan, General Trias in Cavite, a report from the Center for Trade Union and Human Rights…