No barrister, attorney, pleader or vakil shall at any time be permitted, unless with his client’s express consent, to disclose any communication made to him in the course and for the purpose of his employment as such barrister, pleader, attorney or vakil, by or on behalf of his client, or to state the contents or condition of any document with which he has become acquainted in the course and for the purpose of his professional employment, or to disclose any advice given by him to his client in the course and for the purpose of such employment;
Provided that nothing in this section shall protect from disclosure—

Any such communication made in furtherance of any illegal purpose;
Any fact observed by any barrister, pleader, attorney or vakil, in the course of his employment as such, showing that any crime or fraud has been committed since the commencement of his employment.
It is immaterial whether the attention of such barrister, pleader, attorney or vakil was or was not directed to such fact by or no behalf of his client.