Around two hundred people marched to Dublin's City Hall in support of striking Greyhound workers this evening.
SIPTU will be balloting 78 workers from the company tomorrow on whether to accept an invitation from the LRC to attend talks.
The dispute started in June after pay cuts of over 30% were imposed by management.
Greyhound have accepted the invitation and called on SIPTU to condemn efforts to stop lorries leaving their depot in breach of a High Court injunction.
SIPTU spokesman Henry O'Shea said those pickets were not being carried out by the union and had no comment on the issue.