SIPTU members and their supporters will hold a protest outside the offices of employment agency INSOURCE in Dublin today, over an ongoing dispute at Greyhound Household.
Up to 70 workers at the company have been on strike since June 17 in a row over pay-cuts.
Since then, INSOURCE has been providing staff to Greyhound.
SIPTU is calling on the company to cease administering contractors, with spokesperson Owen Reidy claims Greyhound workers are "effectively on the bread-line".