Not a movie, but you should watch Utopia (2013). It's a little hard to find the original version online but it's probably the best tv show I've watched.
Conspiracy focused, dark comedy punctuated by extreme violence (like really unpleasant stuff, but impactful rather than gratuitous).
British TV, so lower budget but excellent cinematography and writing, and really impressive acting. They tried to make an american version but it was a) shit and b) a show about a fake illness based on SARS that the government was using to force people to take a shady vaccine, and they tried to release it in 2020... you can imagine how that went down.