The conduct involved a CEPU official organising employees of a plumbing company performing work at the site to cease working for 3.5 hours on 1 December 2017.
Medical evidence indicates very young children are at a critical stage of cognitive development and may be incapable of understanding their behaviour is seriously wrong.
The crash killed 42-year-old mother Nancy Lefrançois and her 11-year-old son Loïc Chevalier, who were travelling in a passenger vehicle struck in the collision.