A conspirator sneaks around making plans to commit crimes with other people. A conspirator’s plans are often politically motivated, and not always illegal but always secret and sneaky.
You know how some people think that the Apollo moon landing was a hoax or that everything is controlled by alien lizard people? No? Well, people who see secret plots everywhere believe in conspiracies, and anyone involved in a conspiracy is a conspirator. However, many conspirators are real and part of everyday plots, like to rob a bank. All conspirators work in secret to commit crimes. Any crime involving more than one person will have conspirators.