In January 2008, Online Hackers launched a massive attack on the Church of Scientology’s websites, forcing the church to hire computer security experts to reinstate its online presence.

In the end, only one person, 19-year-old Dmitriy Guzner, of Verona, has admitted playing a role in the cyber assault. On Wednesday, three days before his 20th birthday, Guzner is expected to be sentenced by Judge Joseph A. Greenaway Jr. in federal court in Newark. Guzner, who has pleaded guilty to “unauthorized impairment of a protected computer,” faces up to 2 1/2 years in prison and nearly $119,000 in fines.