Nine people have been sentenced for laundering millions of litres of red diesel.
The gang were convicted of concealing and distributing around 4.5million litres of fuel worth an estimated £2.6m.
Headed by Robert Clarke (65), the owner of Clarke Fuels on the Shankill Road, Belfast and Mark Pollock (37), the gang laundered millions of litres of red diesel for sale as legitimate road fuel to unsuspecting motorists.
Clarke from Dundrod Road, Crumlin, and Pollock from Lyndhurst Grove, Belfast, were jailed at Laganside Crown Court yesterday.
HMRC began investigating the gang in 2010 and traced their illegal laundering activities, false paperwork trails and fuel distribution network, revealing a sophisticated organised crime network.
HMRC officers carried out searches of 13 commercial and private premises uncovering a mobile laundering plant, seizing more than £285,000 in cash.