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Employment of workers without the so-called certificate of suitability – Administrative sanction pursuant to art. 1, legislative decree 69 of 1988, conv. by ln 153 of 1988 – Succession of laws over time pursuant to art. 1, paragraph 1097, of ln 205 of 2017 and art. 3-quinquies, paragraph 1, letter. a), of legislative decree 135 of 2018, converted, with amendments, by legislative decree 12 of 2019 – Retroactive application of the more favorable provisions.