The Scenario: You're at the race track hanging around the staging area.
You overhear a conversation that indicates to you Race #7 has been fixed,
and you know who the winner will be. You would:
Immediately
seek out someone in authority at the track and report everything you have
heard.
Seek out confirmation,
despite what you have heard. There is no sense making accusations when
it is possible no one will substantiate them even if they are correct.
Tell everyone
about your unimpeachable tip for Race #7. This will make you very popular
with the race-track crowd.
Bet heavily
on that horse yourself. You pass the tip on, but only to people who promise
to pass similar tips on to you in the future.
Tell the tough-looking
guy with the bulge in his jacket who is guarding the area that you heard
the whole thing. You insist you'll tell the authorities unless he promises
to call off the fix.