DMP took the side of the rich when they attacked working class people

The DMP were a British police force. They wore the British crown above the harp on their tunic (similar to the RIC) and they swore an oath of allegiance to the British monarch. It was therefore quite appropriate that the British ambassador was present at the event.
Mr Moriarty must realise, however, that the DMP were far from a popular organisation among the ordinary Dublin working class, who, in their fight for decent pay and conditions saw the Metropolitan Police time and time again take the side of the rich and powerful businessmen and repeatedly baton-charge workers’ rallies and support strike breakers.