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• Employees of foreign governments or international organizations: 
  • Employees of international organizations
    •  Individuals who obtain or retain immigrant (lawful permanent resident) status:

"You do not lose the tax exemption if you file the waiver and meet either of the following conditions:

• You work for a foreign government and are exempt from U.S. tax under an income tax treaty, consular agreement, the Vienna Conventions, or any other international agreement between the United States and your foreign government employer.
• You work for an international organization and the international organization agreement creating the international organization provides that alien employees are exempt from U.S. income tax. 
• U.S. citizens and resident aliens employed by a foreign government or international organization in the United States should refer to Employees of a foreign government or international organization - How to report compensation for instructions on how to file their U.S. federal individual income tax returns."
  
  https://www.irs.gov/individuals/international-taxpayers/employees-of-foreign-governments-or-internat...