I had to raise an issue with higher management in a big multinational because they said we couldn’t speak any language other than English while on shift (illegal) and that we would lose bonuses or get fired if we did (highly illegal). They even dared to put it in writing and send an email stating ALL of it. Of course, they had to back down. But out of a team of 50-60 people (90% foreigners), nobody else was brave enough to complain. Not even foreign managers.