Spartans, the ultra-nationalist Greek party, will not be allowed to take part in the upcoming European elections in June, a division of the country's supreme court decided on Wednesday, according to Greek radio.
With the decision, the judges granted a petition by the ruling Conservatives, Social Democrats and a smaller left-wing party.
The smaller left-wing party had accused the Spartans of not being a party of their own, but rather a front for the right-wing extremist party Golden Dawn, which has been banned in Greece for years.
The judges have now ruled that the legal requirements for Spartans' lawful participation in the European elections were not met.
An imprisoned right-wing extremist, Ilias Kasidiaris, is said to be the head of Spartans. He once belonged to the leadership cadre of Golden Dawn.
Kasidiaris was a member of parliament for many years before the entire Golden Dawn leadership was convicted of forming a criminal organization and other offences. They have been in prison ever since.
The supreme court's decision could also have an impact on the Greek parliament. The electoral court is currently examining whether the Spartans must lose their 11 seats in the 300-seat parliament because of their close ties to former Golden Dawn leaders.