premise: Temanggung PPP chapter spokesman Parjiono (Eds: one name), said the attack was by members of two youth groups affiliated to Golkar.
  PPP supporters on motorcycles toured the area around Solo on Saturday clashing with security members after they attempted to break through a security barricade in town.
  Violence has swept several Java towns in the past month, much of it connected to rivalry between the PPP and President Suharto's Golkar party, ahead of the general elections on May 29 with campaigning due to start on April 27.
  Indonesia's three official political parties -- Golkar, the PPP and the Indonesian Democracy Party (PDI) -- are contesting the May 29 parliamentary election.
  Golkar has been widely criticised for using government facilities and officials to gain support in general elections.
   What caused Golkar to be widely criticised?
hypothesis: rivalry between the PPP and President Suharto's Golkar party