A visitor walks past a mural featuring the name of Andrie Yunus, the deputy coordinator of the KontraS rights group who suffered serious injuries when two men on a scooter threw acid at him, at the Mural Exhibition "From Citizens for Andrie" in Jakarta on Monday. | AFP-JIJI

Andrie Yunus, an outspoken critic of the military’s expanding power in Indonesia, was riding his motorbike last month in Jakarta when two men rode past and threw acid in his face. He suffered burns to 24% of his body and damage to his right eye.

The ambush, which recalled Indonesia’s decades under a military dictatorship, was captured on street surveillance cameras. Within days, the authorities arrested four members of a military intelligence unit — a captain, two lieutenants and a sergeant.…