Barger had a tough childhood in working-class Oakland - his mother abandoned the family when he was very young and his father was a chronic alcoholic who left him in the care of his elder sister Shirley much of the time.

BBC: Born to raise Hell

Sabo was trafficked to Africa as teenager after he and his family were promised "riches beyond their imagination, " before he was abandoned in Paris.

CNN: Human traffic: Africa's lost boys

He later took the surname of one of his stepfathers, after his biological father abandoned the family, his biography says.

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