One of the girls described her life as "a living hell" from which her and other young victims were unable to extricate themselves.
The men are accused of threatening the girls with physical and sexual violence and telling them that they and their families would suffer if they tried to break away.
Among the long list of offences read to the jury were some which included the use of knives and meat cleavers.
The young victims felt that they could not speak out because they would be dismissed as delinquents. The men ensured that the girls were guarded so they could not escape.
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The judge said the 14-year-old had been subject to a great injustice. He was executed for the murder of two little girls in 1944.
It will be a dull and damp day today, with heavier and more persistent rain to the northwest and across Wales.