The man was sentenced to life after being found guilty of murder, incitement to murder, kidnapping, aggravated extortion, attempted aggravated extortion, weapons offences, unlawful restraint and aggravated robbery.
Some 20 men were charged in the case and 16 were on Wednesday given prison sentences, while two were sentenced to youth detention and two were acquitted.
The case has engaged the services of four prosecutors and covered investigations into three murders and a slew of serious criminal offences linked to gang crime.
The 31-year-old was convicted of having instigated the murder of the leader of the rival X-team criminal gang in December of 2009 at the gambling club Oasen in Södertälje.
The slaying was the catalyst for a several years of bloody conflict between the gangs which police inspector Thomas Nordström characterized as a battle for control of the drugs trade in the area.
In the spring of 2010, a car was fired upon in Södertälje, and the 31-year-old is believed to have been the target.
According to police, the Nätverket gang took exacted revenge by having young Assyriska FF footballer Eddie Moussa and his brother gunned down by assailants wielding automatic weapons at the Oasen club later that year.
The 26-year-old Moussa was a promising young footballer with Assyriska FF, a Södertälje-based club which played one season in Sweden's Allsvenskan top-flight after winning promotion in 2004.