Thanks for all the replies. Much appreciated. My idea isn't the most original idea ever dreamed-up, buy my intent is to at least try to stifle competition if possible.
How about this, an independent-subscontractor contract that states, essentially, roughly: "if, after being hired by me, you, or an affilate of yours, create a similar business, within X years, you agree that I am entitled to half of any proceeds/profit/compensation that is generated by that similar business." This might simply separate the workers I'd like to hire from the would-be competitors that I don't want to hire. I look forward to any feedback.