 Even before then, Princen's outspoken criticism caused him to be arrested and imprisoned in 1957–58.And he spent Sukarno's final years, characterized by increasingly violent power struggles in Indonesia, again serving a prison term 1962–66.Having come to strongly oppose Sukarno, Princen – like quite a few other dissidents – initially placed some hopes in Suharto, who overthrew him following the 1965 attempted coup d'état and whose coming to power had the incidental effect of getting Princen released from prison after four years.