Video footage from the event shows multiple Gardaà approaching an estimated 30 or so protestors to remove them from the loading bay.
Jane Crowe, one former Debenhams worker who was in attendance on Thursday night, told Virgin Media News that she was "forcibly" carried off the premises, resulting in her undergarments being broken.
"We were forcibly lifted up, I was carried out, and while they were carrying me out, my jacket came off over my head, my jumper came off over my head, I was left with no clothes from the waist up," she said.
#WATCH Gardaà have been criticised for breaking up a #Debenhams strike on Henry Street last night