§ 501. Representation. Any person compelled to appear in person or who
voluntarily appears before any agency or representative thereof shall be
accorded the right to be accompanied, represented and advised by
counsel. In a proceeding before an agency, every party or person shall
be accorded the right to appear in person or by or with counsel. Nothing
herein shall be construed either to grant or to deny to any person who
is not a lawyer the right to appear for or represent others before any
agency.