The headquarters of the Hell's Angels and Red Devils' gangs have been raided after one of the biggest undercover operations in New Zealand history.Tasman District Commander, Superintendent Gary Knowles, says by 3pm on Friday, police has searched 31 properties in Nelson, Mapua, Motueka, Takaka, Picton and Blenheim, including the headquarters of the Red Devils in Natalie St, Nelson.The raids were carried out by Armed Offenders and Special Tactics squads. Members of the latter, anti-terrorist squad, train with the SAS.Two more houses were raided in...