Does the New World Order really exist?

Look, I'm not a conspiracy theorist, and I'll never be one cuz to me it sounds like a waste of time. However, I've read about many incidents where people who had groundbreaking discoveries got executed or went missing, which is fishy to me cuz why would it happen to multiple people with such discoveries?

Then one of my cousins told me about this thing called the New World Order which is a large group of higher ups from different countries that rule over a large part of the world, and are aiming for total control over the population. Is this group real? If so, why do they try to suppress anyone that comes up with ideas that can change the world in a good way?