Senator John Thune sponsored the Consumer Review Freedom Act of 2015 which passed the Senate by Unanimous Consent a few weeks ago. Per the Congressional Research Service (CRS):
This bill makes a provision of a form contract void from the inception if it:
(1) prohibits or restricts an individual who is a party to such a contract from engaging in written, verbal, or pictorial reviews, or other similar performance assessments or analyses of, the products, services, or conduct of a person that is also a party to the contract;
(2) imposes penalties or fees against individuals who engage in such communications; or
(3) transfers or requires the individual to transfer any intellectual property rights in any such otherwise lawful communications about such person or the goods or services provided by such person.