Two more politicians from the far-right Golden Dawn party have been jailed on charges of playing a pivotal role in a criminal organisation.
A third member of the party is facing similar accusations and will testify to prosecutors on Sunday.
Giorgos Germenis and Panayiotis Iliopoulos have previously been charged with joining and directing a criminal organisation as part of a government crackdown on the party, which it has branded a "neo-Nazi criminal gang."
According to the state-run Athens News Agency (ANA), a witness said Germenis allegedly had the role of an "army major" in the recruitment and training of new members as well as in migrant attacks.
Another politician, Stathis Boukouras, who faces the same charges, also appeared before magistrates but his fate regarding jail will be decided on Sunday.
Three members of the party, including Golden Dawn leader Nikos Michaloliakos and his deputy, have been jailed since October.
A further three, including Ilias Kasidiaris, the party spokesman, have already been charged in connection with an investigation following the murder of an anti-fascist musician in September.
All three MPs, who had their parliamentary immunity lifted, denied the charges on Saturday, with Iliopoulos claiming that Golden Dawn is not a criminal organisation and that "assault militias don't exist".
'Terrorists are walking free'
About 150 extreme-right supporters, among them Michaloliakos's wife and daughter, chanted slogans and held flags outside the magistrate's office in the afternoon..
"The terrorists are walking free," Ilias Kasidiaris said referring to the recent escape while on a furlough of far-left militant Christodoulos Xiros, member of the 17 November organisation, designated a terrorist group.
"The hustlers of PASOK and New Democracy are walking freely, not even one MP or minister has been called in for questioning for the scandals and the bribes. The only ones dragged in examinations and illegal imprisonments are Golden Dawn MPs," he added.
Golden Dawn announced during a press conference on Friday its intention to challenge the Greek government's crackdown on its party in the European Court of Human Rights.
Procedures that led to the jailing of Michaloliakos and other MPs were denounced as "illegal and unconstitutional" to reporters present.
The press conference was also attended by MEP Nick Griffin, leader of the far-right British National Party, who pledged his support for the neo-Nazi party.
The September killing of leftist rapper Pavlos Fyssas prompted a government crackdown against Golden Dawn that magistrates say has unmasked the group's violent paramilitary activities.