Frank Hanebuth, who rose through the Hells Angels ranks in the German city of Hanover before allegedly leading the club's Mallorca branch, was cleared of all charges.
The prosecution had requested a prison sentence of up to 13 years and a 4.2 million euro ($4.45 million) fine.
Khalil Youssafi was sentenced to nine years and nine months in prison, but the penalty was replaced by a fine following his plea agreement.
The Hells Angels Motorcycle Club, which was formed in the United States in 1948 and has some 5,000 members at about 350 branches - dubbed "chapters" - around the world, founded its Mallorca chapter in 2009, according to Spanish authorities.
In 2013, Spanish police clamped down on the Mallorca chapter, which was mostly made up of German and Turkish members.
Persons:
Frank Hanebuth, Khalil Youssafi, Abdelghani Youssafi, Paul Engelke, David Latona, Emma Pinedo, Timothy Gardner
Organizations:
Hells Angels, Hells Angels Motorcycle Club, Spanish
Locations:
MADRID, Spain, Mallorca, German, Hanover, United States