176.7.1. The Commission may intervene at any time before a review office, until the end of the proof and hearing, if any.
Where the Commission wishes to intervene, it shall send notice to that effect to each party and to the review office; it becomes thereupon party to the review.
The same applies to the worker concerned by an application for review relating to the application of section 329 of the Act respecting industrial accidents and occupational diseases (chapter A-3.001).