The FBI said that five of the men were involved in the group Lulzsec, while a sixth was a “member” of Antisec.
It said that Lulzsec’s “leader” Hector Xavier Monsegur had pleaded guilty in August to 12 criminal charges.
The BBC understands Mr Monsegur subsequently co-operated with the FBI.
It is believed that this action helped lead to the other accusations.
Source: BBC News