Algeria restrained Polisario support fearing Moroccan Islamist revolution. [causal]
Though Algeria continued to back Polisario against America's ally, King Hassan of Morocco, their support was limited by balanced fears that the fall of Hassan might lead to a Khomeini-style revolution and Islamic fundamentalist anarchy on Algeria's western flank.
Horne, Alistair, A Savage War of Peace- Alge…, loc. 1683