Gerry "The Monk" Hutch and ex-Sinn Fein councillor Jonathan Dowdall have lost their High Court actions aimed at preventing them from being tried before the non-jury Special Criminal Court on charges of murder arising out of the Regency Hotel attack in 2016.
In his judgement on Friday, Mr Justice Anthony Barr said he was satisfied to dismiss the men's actions.
The judge said that having considered all the various arguments raised by the parties he had reached the conclusion that all of the reliefs sought by the two accused "must be refused."
The judge added that there was no basis in law to prevent the Director of Public Prosecution certifying that their trials on the charge of murder should be tried before the SCC.
Hutch (58), who was extradited from Spain, and former Dublin City councillor Jonathan Dowdall (44), of Navan Road, Dublin, are both charged with the murder of David Byne (33) at the Whitehall, Dublin, hotel on February 5, 2016.
In their judicial review proceedings they both sought declarations from the High Court that their trials before the SCC would be unlawful and in breach of their fundamental rights because the SCC is operating as a permanent court when it was only set up on a temporary basis nearly 50 years ago.
Their actions were against the Minister for Justice, Dail Eireann, Ireland and the Attorney General, while Seanad Eireann is also a respondent in the Hutch case.
They also sought various declarations including that a trial before the SCC, is unlawful, outside the powers of the 1939 Offences Against the State Act and violates their constitutional and European Convention rights.
They further claimed the failure by the State to enact anything other than temporary measures in respect of procedures for the trial of persons before the SCC also breaches their rights.
They claimed that they should not be tried under what amounts to temporary legislation introduced in 1972 during the Troubles in response to an emergency situation at the time but has since been extended to deal with serious organised crime.
The respondents denied their claims and say, among other things, there is a failure by the men to adequately, or at all, to particularise the legal basis for the reliefs they seek.
To get the latest breaking news straight to your inbox, sign up for our free newsletter.
