A person acting on behalf of another person or group​

An agent in commercial law (also referred to as a manager) is a person who is authorized to act on behalf of another (called the principal or client) to create a legal relationship with a third party.

Explanation:

I searched it up : )

Roosevelt

after taking over the  the presidency, he adopted as its main goal the fight against the crisis using the "new deal", which admittedly was a moderate success, but managed to restore public confidence in their own strength, which resulted into a number of new investments in the activation of society and insurance. numerous ill-prepared laws were annulled by the supreme court. despite these shortcomings, new deal in his  re-election for another term.