scrutineers and invigilators, aboveboard

Open
The Datastore is part of a larger policy of openness decreed by London Mayor Boris Johnson, who hopes the open information will give rise to "a great army of unpaid scrutineers and invigilators" who would keep city politicians aboveboard. One site built from the data, WhereDoesMyMoneyGo.org, makes it easy for citizens to see how their taxes are spent.

Read more: http://www.time.com/time/photogallery/0,29307,2040574,00.html#ixzz1AP0CjbA0

aboveboard

(ə-bŭv'bôrd', -bōrd')
adv. & adj.
Without deceit or trickery; straightforward.

[Originally a gambling term referring to the fact that a gambler whose hands were above the board or gaming table could not engage in trickery, such as changing cards, below the table.]