The extremely popular Uncaged series is, among other things, a re-examination of classic female monsters through a feminist lens, and fairly political:
Uncaged | Volume I - Dungeon Masters Guild | Dungeon Masters Guild
Eat the Rich is a series of explicitly anti-capitalist D&D adventures:
Eat the Rich | Volume 1 - Dungeon Masters Guild | Dungeon Masters Guild
Eat the Rich ran afoul of a OneBookShelf policy that states that overtly political works are not allowed on DMsGuild. Only one of the planned 4 volumes was published, and after publication the description had to be changed to remove the term "anti-capitalist." I don't think the 3 other volumes were ever published anywhere. You can read an explanation here of what happened with the first book (which did go Platinum on DMsGuild):
A Statement Regarding Volume 1 | Eat the Rich Anthology
EDIT: Correction, the rest of the Eat the Rich series was stripped of WotC IP and published on DriveThruRPG, which doesn't have the same restrictions on political content:
DriveThruRPG.com - Eat the Rich Anthology - The Largest RPG Download Store!
I wrote this short tier one adventure; it includes some ideas about health care as a human right (vis-a-vis D&D's diamonds-for-resurrection spell mechanics) that are a fairly obvious political allegory, although I didn't write, like, the whole adventure as a screed about the U.S. health care system:
The Girl Who Woke the Dead - Dungeon Masters Guild | Dungeon Masters Guild