User blog comment:Sppople/Fellowship of the Ring - Main Antagonist? (Wiki Update)/@comment-71.13.63.215-20170320172011

Sauron seems to be the main antagonist, though you don't see him working as openly as others. Sauron is always the antagonist, for he is working behind his pawns, including Saruman; though the latter becomes increasingly independant as the books go on. He works especially through the Nazgul and the power of the Ring in the first book, and perhaps to a lesser extent through the inhabitants of Moria.

-Ranger of the North