References for a preliminary ruling from the Pretura Circondariale di Roma, Sezione Distaccata di Tivoli, by orders of that court of 25 March 1995 (C-154/95), 3 April 1995 (C-157/95), 3 May 1995 (C-174/95), 27 April 1995 (C-175/95) and 10 May 1995 (C-176/95) in the criminal proceedings pending before that court against Isidoro Narducci, Fulvio Smaldone, Siro Mattei, Bruno Belli and Armando Scrocca (Cases C-154/95, C-157/95, C-174/95, C-175/95 and C-176/95)