The Treaty of Rome was signed in March 1957, creating the European Economic Community (EEC). The idea was that this would ensure free trade in goods between member states. The treaty accepted that it was not possible to drop all tariff barriers between member states immediately, so countries were instructed to reduce, and ultimately abolish, them as quickly as possible.
Tariff increases were banned; if a country breached this principle it would be sued by either a member state or the European Commission (the EEC's civil service).
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The Dutch authorities argued that the treaty allowed them to raise tariffs in specific cases. More importantly, they argued that member states, not individuals or private companies, were the only ones who could enforce the treaty in the courts.
Initially, it seemed the Dutch would prevail. The advocate-general, who advises the European Court of Justice (ECJ), concluded that individuals could sue to enforce some parts of the treaty, but the tariff clause was not one.
However, the ECJ ignored this and ruled that all citizens were entitled to sue and that national courts had to enforce the law, rather than refer the matter to the ECJ. This resulting doctrine of "direct effect" is now a bedrock of European law, and has made it harder for countries to get around EU rules.
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