Members of Greece's anti-terrorism squad on Thursday searched the homes of three Golden Dawn deputies, local media report.
The three ultranationalist MPs – Stathis Boukouras, Giorgos Germenis, Panayiotis Iliopoulos – face charges for participating and managing a criminal organization.
Greek lawmakers voted to lift their immunity in October.
Meanwhile, reports on Wednesday said that another 12 people are likely to be added to the list of Golden Dawn supporters suspected of committing a range of crimes that had not been officially linked to the neo-Nazi party until now.
Incidents which are set to be added to the case file include the murder of a 27-year-old Pakistani man on his way to work in Athens on January 17 this year. He was stabbed by two men on a motorcycle. Two suspects aged 25 and 29 were arrested. Golden Dawn fliers were found at one of the men’s houses.
Another incident allegedly connected to the party is the near-fatal stabbing of a 17-year-old pupil outside a school in Neo Faliro, southern Athens, in January. One of the two men arrested, aged 20, has since been identified as having links to Golden Dawn.
The party’s deputy leader, Christos Pappas, failed on Wednesday in his bid to be granted conditional release from pretrial custody. Earlier this week, Golden Dawn chief Nikos Michaloliakos also had his request turned down.