Abstract
This article illustrates the factors leading to the entry of irregular immigrants and their integration into the labour market, that is to say: the economic convenience for both businesses and families of employing unauthorised manpower; the support from compatriot networks and ethnic economies; the embedded liberalism within democratic states' legal systems; the cost and organisational difficulty of controls and expulsion; and the part played by solidarity providers in civil society, including trade unions. Repeated mass amnesties especially in southern Europe, periodically regularise the situation of these migrants and function as the principal tool of migration policy. To this extent, the irregular immigrant appears to be a transitional figure, awaiting recognition and destined to obtain authorisation sooner or later. Trade unions are one of the social groups pushing for the enactment of regularisation measures. In this way they are asserting their attachment to the ideals of justice and solidarity, while at the same time combating the unfair competition which the hidden economy poses to law-abiding companies and declared workers.

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