 (Princen would be among those who would eventually reveal it).Among the earlier campaigns which Princen conducted was on behalf of the left-wing writer Pramoedya Ananta Toer, imprisoned and tortured by the Suharto regime.At the end of 1969 he published, jointly with the journalist Jopie Lasut, an extensive report on the mass murder of Communist sympathizers at Purwodadi in Middle Java – for which Princen and Lasut were promptly arrested and interrogated.