I think the Universal Declaration of Human Rights is a good objective standard (agreed to by the family of nations) by which to judge the laws of any nation- in its treatment of its own citizens or citizens of other countries living or working there. This is true whether we are speaking of how Qatar treats its foreign workers or how the U S should be treating 'foreign combatants' .

The UDHR in English is found here:
http://www.unhchr.ch/udhr/lang/eng.htm

In Arabic it is here:
http://www.unhchr.ch/udhr/lang/arz.htm