Opposition leader Vuk Draskovic(L) hugs Dejan Bulatovic, 21-year old worker who was imprisoned for 25 days for carrying effigy of Serbian President Milosevic, during a protest against election rigging in Belgrade center December 30. A threat of dissidence in the Yugoslav army emerged on Monday as a fresh obstacle to efforts by President Slobodan-Milosevic to quell six weeks of street unrest against 50 years of unbroken socialist rule in Serbia.