A prominent Celtic supporters group has expressed anger at the club's "alarming" decline and "continued mismanagement".The rancour of last season has returned over the past month after a Champions League play-off collapse against LASK and three defeats in eight days - includingtwo derby losses to Rangers - leading into the current international break.On Tuesday the club announced a loss after tax of £4.8m for the year ending June 30, 12 months on from making a profit of £33.9m, and a