A total of 17 men and one woman have been convicted of, or have admitted, charges including rape, supplying drugs and inciting prostitution, in a series of trials at Newcastle Crown Court.
Older men preyed on immature teenagers who were plied with cocaine, cannabis, alcohol or mephedrone, then raped or persuaded into having sexual activity with the lure of the illegal drugs at parties known as "sessions".
Defendants were charged with conspiracy to incite prostitution for gain - reflecting how women were exploited with drink or drugs.
Roles within the conspiracy included providing the premises, supplying drugs, transporting victims, having sex with them or encouraging it to happen.
There was no suggestion the victims were working as prostitutes or were paid.
Not all the defendants were part of the conspiracy.
Greg Stone, a city councillor from the opposition Liberal Democrats, said at least two convicts were not Muslim but warned extremists were thriving on false claims of a “cover up” by police officers.