All they want is candy. Give them some, and they will probably leave you alone.
Likewise, do not take attempt to repel, apprehend or otherwise take defensive action against the assorted super-heroes, football players, princesses, ninjas or political figures who accompany them. Unless they are, in fact, actual politicians bothering you on Halloween and not just children wearing uncomfortable masks who probably don't get the joke anyway. Then do what you must.
As you prepare for tonight's annual onslaught of sugary entitlement, take a few minutes to enjoy what may quite possibly be the greatest Halloween costume ever.