What conspiracy theories turned out to be true?

 I am not an expert on history, so I have accepted these claims as being accepted by reputable historians and authors and scholars. I don't have absolute personal knowledge or belief without any caveats regarding these ideas.

I happen to know that the idea that the Scientology cult has intentions of taking over the world and concealing their true intentions from most people is true from having been in Scientology for twenty five years. That is the one conspiracy theory that I can assure you from personal direct experience is true.

Many people in Scientology don't realize this but if you are in Scientology long enough and progress far enough in your indoctrination then at some point you either accept this, deny it to yourself despite strong evidence or disagree with it and most likely leave Scientology.

The ones that are interesting that turned out to be true are many. The business plot is among my favorites.

The Business Plot (also called The White House Putsch) was a political conspiracy in 1933 in the United States to overthrow the government of President Franklin D. Roosevelt and install a dictator.

COINTELPRO (syllabic abbreviation derived from Counter Intelligence Program) (1956- unknown) was a series of covert and illegal projects conducted by the United States Federal Bureau of Investigation (FBI) aimed at surveilling, infiltrating, discrediting, and disrupting domestic American political organizations.

Operation Snow White was a criminal conspiracy by the Church of Scientology during the 1970s to purge unfavorable records about Scientology and its founder, L. Ron Hubbard. This project included a series of infiltrations into and thefts from 136 government agencies, foreign embassies and consulates, as well as private organizations critical of Scientology, carried out by Church members in more than 30 countries. It was one of the largest infiltrations of the United States government in history, with up to 5,000 covert agents. This operation also exposed the Scientology plot 'Operation Freakout', because Operation Snow White was the case that initiated the U.S. government's investigation of the Church.

Here is a link to an article on several more.

https://www.businessinsider.com/true-government-conspiracies-2013-12

The sad reality is that governments are so large that inevitably some of the people involved become involved in conspiracies and some of these conspiracies get exposed over time. This doesn't mean that everyone in the government is a criminal or involved in conspiracies or aware of them. You can be in a company and unaware of a conspiracy that the leadership is engaged in.

You can also have an accusation that is not true. Just because some people in government sometimes engage in conspiracies it in no way means that everyone is always in some conspiracy and you just need to figure out the details. It doesn't work that way.

That is like saying that most people lie some of the time so everyone is always lying and you just have to figure out what they lie about and what they are hiding. No.

Just as people may go a long time without lying and be honest, people in the government may go a long time without lying and be honest as well. Now, I am not saying to trust the government by default and I am not saying to believe they are always lying and hiding crimes by default either. You have to use your best judgement and independent and critical thinking to evaluate each claim they make unfortunately. There is no shortcut to the truth.