[RIMR]

The source is ARIN itself, and they clearly state what he did:

>the elaborate scheme involved the use of legally registered but non-existent companies Golestan claimed were “Channel Partners” to defraud not only ARIN but also the entire Internet community. The prosecutors proved that “through this scheme, Golestan and Micfo obtained the rights to approximately 757,760 IP addresses, with a market value between $9,850,880.00 and $14,397,440.00.”

So basically, he stole tons of IPv4 address space he wasn't legally entitled to by using tons of shell companies with no purpose but to defraud ARIN.