ECJ 10 February 2011, cases C-307 through 309/09 (Vicoplus SC PUH, BAM Vermeer Contracting Sp.zoo and Olbek Industrial Services Sp. zoo, Work and residence permit
Articles 56 and 57 TFEU do not preclude a Member State from making the hiring-out of workers from the Member States that acceded to the EU in 2004 subject to a work permit requirement during the relevant transitional period. Cross-border hiring-out of workers is characterised by the fact that the movement of workers to the host Member State constitutes the very purpose of the services provided by the workers’ employer.
European Court of Justice (ECJ), 2011-02-10