Technically none, however they had, and continue to have the domestic counter intelligence mission. Plus, I think sending money to terrorists is a federal crime, so their normal law enforcement duties would apply as well.
The Clintonistas gave plenty of money aboveboard and in the open to the PLA, which is just as good as giving it to Hamas, Fatah (various factions) and Islamic Jihad. I'm sure you've noticed how many of the masked Pali "gunmen" have AR-15s? Well many of those were provied to them, via the so called Palistinian "Security Services", by ol Billy Jeff.