It was only as late as December 1917 that a War Cabinet Committee on Manpower was established, and the British government refrained from introducing compulsory labour direction (though 388 men were moved as part of the voluntary National Service Scheme). Belgian refugees became workers, though they were often seen as "job stealers". Likewise, the use of Irish workers, because they were exempt from conscription, was another source of resentment.[124] Worried about the impact of the dilution of labour caused by bringing external groups into the main labour pool, workers in some areas turned to strike action.