Here's a great place to start.

https://en.wikipedia.org/wiki/History_of_the_Central_Intelligence_Agency#Abuses_of_CIA_authority.2C_1970s.E2.80.931990s

I haven't met many people who are unaware of the US Government's activities meddling in the political affairs of foreign states, prosecuting wars, and overthrowing governments in order to further the interests of those who rule the country.