Marinaleda was ruled by CUT-BAI (Collective for the Unity of Workers - Andalusian Left Bloc) from 1979 until 1986, when CUT-BAI joined United Left (IU), which has since been the ruling party, although most of the members of IU's local branch are basically members of CUT-BAI.
Marinaleda was ruled by CUT-BAI from 1979 to 1986, when they joined forces with United Left (IU).  IU has remained in power since then, although most of its local members are former CUT-BAI members.