Perhaps because they were unable to orchestrate the invasion of Syria, the Saudis are turning now against the very people they have been using. They are now seeking to throw out of their country any undocumented person fearing that they will rise up against the government and monarchy for religiously they support no separation of state and religion.
Many of the people being thrown out are simply workers. But the sudden turn against all undocumented people is a cover for trying purge the very terrorist sympathizers they have exploited in Syria to get the pipeline. This could lead to an all out war between the Sunni and Shiite sects.
http://observers.france24.com/content/20131115-riots-saudi-arabia-kingdom-expels