The court yesterday convicted provincial deputy Frederic Batumike for organising the violence that began in 2013 and continued for years in the village of Kavumu, about 25 kilometres north of Bukavu city.
Young girls were raped in the militia members' superstitious belief that it would make them "impervious to bullets," a United Nations report said earlier this year.
The organisation Physicians for Human Rights called it the first time a sitting government official in Congo had been found guilty of "superior responsibility for crimes he and his militia, whom he controlled and financed, committed."
Immunity was waived for Batumike, a member of parliament, to stand trial.
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"This trial demonstrated that justice can be served in the Congo, when an investigation is effectively carried out and evidence is methodically collected, even when the accused wield significant power and are highly organised," said Karen Naimer, director of the organisation's program on sexual violence in conflict zones.
The US Embassy said on Twitter that the court's decision marks an important step for justice and the respect of rights in Congo.
Families and victims expressed relief at the verdict. "Following years of silence, motivated by fear and denial, their suffering has been brought to light and recognised publicly," said Charles Cubaka, spokesman for the lawyers representing the victims. "The long road ahead for the recovery of these young girls can now proceed.
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