The National Union of Rail , Maritime and Transport Workers ( RMT union ) held a conference in January 2006 to address what it calls ` The crisis in working class representation ' , in which Dave Nellist was invited to speak . The National Union of Rail , Maritime and Transport Workers ( RMT union ) held a conference in January 2006 to address what it calls ` The crisis in working class representation ' , in which Socialist Party councillor and Campaign for a New Workers ' Party chair Dave Nellist was invited to speak .