The longstanding effort to keep extremist forces out of government in Europe is officially over.

For decades, political parties of all kinds joined forces to keep the hard-right far from the levers of power. Today, this strategy — known in France as a cordon sanitaire(or firewall) — is falling apart, as populist and nationalist parties grow in strength across the Continent.

Six EU countries — Italy, Finland, Slovakia, Hungary, Croatia and the Czech Republic — have hard-right parties in government. In Sweden, the survival of the executive relies on a confidence and supply agreement with the nationalist Sweden Democrats, the second-largest force in parliament. In the Netherlands, the anti-Islamic firebrand Geert Wilders is on the verge of power, having sealed a historic dealto form the most right-wing government in recent Dutch history.

Meanwhile, hard-right parties are dominating the polls across much of Europe. In France, far-right leader Marine Le Pen’s National Rally is cruising at over 30 percent, far ahead of President Emmanuel Macron’s Renaissance party, according to POLITICO’s Poll of Polls. Across the Rhine, Alternative for Germany, a party under police surveillance for its extremist views, is polling second, head-to-head with the Social Democrats.