translate English to French: Combating illegal immigration requires concerted and effective measures directed to undeclared work and illegal employment, in particular through the effective enforcement of dissuasive sanctions.
La lutte contre l’immigration clandestine suppose la mise en place de mesures concertées et efficaces visant à combattre le travail non déclaré et l’emploi illégal, en particulier l’application effective de sanctions dissuasives.