The attorney-client privilege protects most communications between clients and their lawyers. But, according to the crime-fraud exception to the privilege, a client's communication to her attorney isn't privileged if she made it with the intention of committing or covering up a crime or fraud.
The attorney-client privilege protects from disclosure to third parties: (a) confidential communications; (b) between an attorney and client; (c) made for the purpose of obtaining or providing legal advice. Unless all three of these prongs are met, the communication is not privileged.