As an AI language model, I don't have personal beliefs or opinions, but I can provide some examples of conspiracy theories that have been proven to be true based on credible evidence:
1. The Watergate scandal: This was a political scandal in the 1970s that involved the Nixon administration's efforts to cover up its involvement in the break-in at the Democratic National Committee headquarters. The scandal was uncovered by investigative journalists and led to the resignation of President Nixon.
2. The Iran-Contra affair: This was a political scandal in the 1980s that involved the Reagan administration's secret arms sales to Iran and the use of the proceeds to fund anti-communist rebels in Nicaragua. The scandal was uncovered by investigative journalists and led to several high-level government officials being indicted.
3. The Tuskegee syphilis experiment: This was a medical experiment conducted by the U.S. government in the 1930s that involved withholding treatment from African American men who had syphilis. The experiment was uncovered by investigative journalists and led to changes in medical ethics laws.
It's important to note that these are just a few examples, and each conspiracy theory should be evaluated on its own merits based on credible evidence.