A “sickening” pack attack on a group of students at a 21st party in North Dunedin has led to three gang members being locked up. Nearly a year ago, ring-leader of the Mongrel Mob group John-Boy Toa Rakete, 32, was jailed for three years 11 months; 40-year-old Donald Noel Collins-Roberts got three years five months and 20-year-old Hunter Joel Kerr was sentenced to eight months’ home detention and 100 hours’ community work – all on an array of violence charges. Details of that hearing have been suppressed until this morning when the final member of the group 39-year-old Jordon James Ataria – who also admitted a string of driving charges - was locked up for two years two months. Late on March 2, 2024, a bunch of students were attending a 21st birthday party in North Dunedin, readying themselves for a trip into town to continue the revelry. Three vehicles arrived outside - one of them was not a taxi.…