The National Union Committee (NUC), a leftist nationalist movement associated with the labour unions, was formed in 1954 calling for the end of British interference and political reforms. Work sites were plagued with frequent strikes and occasional riots (including several fatalities) during this period. Following riots in support of Egypt defending itself against the tripartite invasion during 1956 Suez Crisis, the British decided to put an end to the NUC challenge to their presence in Bahrain. The NUC and its offshoots were declared illegal. Its leaders were arrested, tried and imprisoned. Some fled the country while others were forcibly deported.