Judgment of the General Court (Third Chamber) of 10 November 2015 Judgment of the General Court (Third Chamber) of 10 November 2015.#Gruppo Servizi Associati SpA (GSA) and Security Guardian's Institute (SGI) v European Parliament.#Public service contracts — Tendering procedure — Supply of fire security, assistance to persons and external surveillance at the European Parliament’s site — Rejection of a tenderer’s bid — Obligation to produce prior authorisation issued pursuant to national legislation — Proportionality — Equal Treatment — Principle of openness — Freedom to provide services.#Case T-321/15.