The article doesn't mention the FBI most wanted list, where did you get that from? Are you confusing ROKSO w/ the FBI? Spamhaus is a crooked extortion organization ran by former spammers themselves, not some squeaky clean protectors of the Internet.
I'm puzzled. I have been referring to a quite old article that doesn't mention anything about FBI anymore. Unless I'm heaving early Alzheimer, I can swear reading at multiple spots that Nathan Blecharczyk was once on 100 FBI top wanted. I'm confused by this, however I guess the minimum I can do is not mention that "fact" anymore.
From the article that was linked in a few posts up: He was running a major spam operation, and he got into a list of known spammers arranged by SpamHaus (an anti spam organization). The list happens to have about 100 people.
It's said that he received a few letters from the FBI and other law enforcements while he was running the operations. Nothing specific.