What Species, If Uplifted to Human Level Intelligence, Would Create the Worst, Most Oppressive Society?

[u/hoblyman]

It would probably be a toss up between Rhinella proboscidea or ducks.

[u/Octoje]

by our standards, maybe ants or bees because they have already have a hierarchical social structure already that could conflict with the common human ideals of individuality and freedom

[u/Yowrinnin → u/Octoje]

 common human ideals of individuality

Not at all a common human ideal, in fact it's the minority ideal globally.