Over the past week, Tanzanian police have arbitrarily arrested 375 members and supporters of the country’s main opposition party, the Party for Democracy and Progress (Chama cha Demokrasia na Maendeleo, or Chadema). Among them are former presidential candidate Tundu Lissu, party chairman Freeman Mbowe, party youth wing leader John Pambalu, and several journalists. The arrests took place ahead of the party’s planned August 12 International Youth Day celebration in the city of Mbeya.