That doesn't seem plausible, because you can't stop bribery by telling people that bribery is against the rules. Everybody already knows that.
If they became aware of bribery and genuinely wanted to stop it, the way is to publicly punish the culprits as harshly as they can, to demonstrate to others that enforcement of the rules can happen.
Yes and no. You might not even realize that what you did constitutes giving or receiving a bribe. What cracks me up though is that all large US megacorps give tens of millions of dollars in thinly veiled bribes to officials each year, as they browbeat their employees into not accepting a god damn fruit basket from a thankful client.
If they became aware of bribery and genuinely wanted to stop it, the way is to publicly punish the culprits as harshly as they can, to demonstrate to others that enforcement of the rules can happen.