But it was never convincingly proved to Western academic specialists , and has been challenged by some Indonesian accounts .
This case relied on a confession by the alleged head of the bureau , named Sjam , during a staged trial in 1967 .
It was never convincingly proved to Western academic specialists , and has been challenged by some Indonesian accounts .
This case relied on a confession by the alleged head of the bureau , named Sjam , during a staged trial in 1967 .