The alleged co-founder of National Action has denied being a member of the neo-Nazi group after it was banned by the government.
Alex Davies, 27, pleaded not guilty to membership of a proscribed organisation on Friday.
The Old Bailey heard that he allegedly continued to be part of National Action after it was listed as a terrorist group on 16 December 2016, until 27 September 2017.
Being a member of the group was not a criminal offence until the 2016 ban.
Mr Davies, of Uplands in Swansea, appeared at the hearing via video-link.
Judge Mark Dennis QC freed him on bail ahead of a trial due to start on 19 April.
