The period between 1908 and 1914 was known as 'The Great Unrest' as Britain experienced a number of major industrial conflicts during this time. In Wales, coal miners employed at the Cambrian Combine Collieries went on strike, clashing with troops at Tonypandy in 1910, while a strike by the seamen of Cardiff in 1911 led to attacks on members of the town's Chinese community.
During the summer of 1911 a national railway strike brought chaos to many parts of the country and troops were called in to keep the trains running. On Thursday, 17 August, strikers at Llanelli held up the trains at one of the level crossings in the town.
The following day, when troops were called to clear the line, events got out of hand, the Riot Act was read, shots were fired, and two innocent men (Leonard Worsell and John John) were killed.
http://www.gtj.org.uk/en/small/item/GTJ69243/