A 21-year-old US citizen who was allegedly a major actor in an online network that targeted children for acts of violence and sexual exploitation is facing extradition after his arrest in the northern Greek city of Thessaloniki earlier this week.
The suspect, identified by US authorities as Leonidas Varagiannis, is accused of playing a key role in a US-based criminal online group, which goes by the name 764, leading its core subgroup "764 Inferno".
