Company policy cannot overrule laws, but it is not illegal to put it in a contract. Companies put in things they can't enforce because it has the same effect of

Company policy cannot overrule laws, but it is not illegal to put it in a contract. Companies put in things they can't enforce because it has the same effect of discouraging certain behaviors. A company's policy cannot prohibit employees from talking about the company. Obviously there is more nuance (e.g. leaking internal info) but in this case we're discussing public events.