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.
More top news
The Suitsy: Man creates business suit onesie
Alex Salmond has announced his intention to end a 24-year career at the forefront of Scottish politics. Here is a brief look at his career.
Britain is among the least devolved countries in the world, figures from the RSA show.