The heads of the haredi parties, Ministers Arye Deri (Shas), Yaakov Litzman (UTJ), and MK Moshe Gafni (UTJ) sent an urgent letter to Prime Minister Binyamin Netanyahu on Thursday evening, bearing an ultimatum: gives us our Shabbat, or we take your coalition. Haredi MKs have been in an uproar these past few days over the government-sanctioned…