Perspective on ARIN allocations to non-American entities

I've searched the IANA and ICANN sites, and have found no justification for what appear to be ARIN allocations to foreign entities within 66.231. Two serious UCE/hacking attempt offenders are as follows: 66.231.64.0/20 GIGA-BLK-1 66.231.128.0/20 ECON-BLK-1 Both of which appear to be completely unapologetic for their users' activities and refuse to take any action against repeat offenders (10's of thousands of attempts per week here). Why have these blocks apparently been allocated via ARIN? Am I missing something? Cheers, Brian