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Treaty on the Functioning of the European Union
Effective since 1958, the now so-called Treaty on the Functioning of the European Union (also known as TFEU and formerly known as the Treaty establishing the European Community) among other things created a customs union between the Member States and set up the European Commission. Later versions introduced the so-called four freedoms (free movement of people, goods, services, and capital). The treaty defines roles, policies, and activities of the EU in detail. The TFEU is one of the two treaties together with the Treaty on European Union that set the constitutional basis for the EU.