LSC representation of aliens is limited to certain classes of aliens who broadly may be described as lawful permanent residents, prospective lawful permanent residents and one specific group of temporary, nonimmigrants.
The LSC represents illegal aliens who are not lawful residents. 
mnli hypothesis: The LSC represents illegal aliens who are not lawful residents.  premise: LSC representation of aliens is limited to certain classes of aliens who broadly may be described as lawful permanent residents, prospective lawful permanent residents and one specific group of temporary, nonimmigrants.