I think Delta Green is still worth playing. They're not a conspiracy of the "secretly running everything" type, just the "secret cover-up" kind, and honestly they're kind of terrible at doing that most of the time.
The recently published campaigns, Impossible Landscapes and God's Teeth, are both fantastic. The latter is very politically minded, with some horrors only possible in the story because of real-world atrocities of the Trump administration. It's also the darkest fucking game I've ever played in, and would be way too much for most tables.