26f8fc6e_rization___Controller_s_Office__Characterization_of_Group
[Classification] Immigrants (Permanent Residents) [Notes] No limits at all on the employment they may legally hold; will be able to show Resident Alien Card (I-151 or I-551) [Characterization of Group] 
Those who have been granted permanent residence in the U.S.; may stay forever in this status
Visa Classifications and Work Authorization | Controller's Office
Characterization of Group