Declan Winkless must now serve more time in jail after a Court of Appeal ruling.
Tyneside drugs gang members Youssef Wynne and Josh Hawthorn's sentences are upheld by appeal judges.
The Home Office had challenged a High Court ruling that the group's proscription should be quashed.
Nerys Lloyd's bid to shorten her sentence caused further pain, two of her victims' families say.
A lawyer explains how children are sentenced and what happens when a case is referred to the Court of Appeal.
She told BBC Newsnight she was living in fear after the attack by teenage boys, whose sentences are being reviewed.
The teenager tells BBC Newsnight she is suffering from flashbacks and living in fear following the attack.
The sentences of boys spared custody over the rape of two girls in Hampshire will be referred to the Court of Appeal, the prime minister has said.
