Under United States law ing to the Restatement (Third) of Agency § 2.06, an undisclosed principal may still be held liable to a third party who justifiably is induced to make a detrimental change in position, even if the agent lacked actual authority to act on behalf of the principal, so long as the undisclosed ...
An unidentified or partially disclosed principal is one that the other party to a transaction knows only that the agent may be acting on behalf of but not the identity of that principal; both the agent and the undisclosed principal are liable for such transactions.
A person is always liable for her own torts, so an agent who commits a tort is liable; if the tort was in the scope of employment the principal is liable too. Unless the principal put the agent up to committing the tort, the agent will have to reimburse the principal.
Additionally, principals can be held liable for the torts of their agents under the doctrine of vicarious liability. A principal is always liable for torts committed while the agent completes their official responsibilities.
Under the UCC, a “signature” is any writing or mark used by a person to indicate that a writing is authentic. Agents often sign on behalf of principals, and when the authorized agent makes clear that she is so signing—by naming the principal and signing her name as “agent”—the principal is liable, not the agent.
Principal's liability for acts of agent A principal is normally liable for all acts of an agent within the agent's authority, whether responsibility arises in contract or in tort. Authority means the agent's actual, apparent (ostensible) or usual (customary) authority.
A principal is always liable for torts committed while the agent completes their official responsibilities. For torts occurring outside of official duties, the liability of the principal depends on whether the agent's tort occurred during a frolic or a detour.
Similarly, if the agent or principal loses capacity to enter into an agency relationship, it is suspended or terminated. The agency terminates if its purpose becomes illegal. Even though authority has terminated, whether by action of the parties or operation of law, the principal may still be subject to liability.