The Grand National Consolidated Trades Union of 1834 was an early attempt to form a national union confederation in the United Kingdom.
There had been several attempts to form national general unions in the 1820s, culminating with the National Association for the Protection of Labour, established in 1830. However, this had soon failed, and by the early 1830s the most influential labour organisation was the Operative Builders' Union.
In 1833, Robert Owen returned from the United States, and declared the need for a guild-based system of co-operative production. He was able to gain the support of the Builders' Union, which called for a Grand National Guild to take over the entire building trade. In February 1834, a conference was held in London which founded the Grand National Consolidated Trades Union.
The new body, unlike other organisations founded by Owen, was open only to trade unionists and, as a result, initially Owen did not join it. Its foundation coincided with a period of industrial unrest, and strikes broke out in Derby, Leeds and Oldham. These were discouraged by the new union, which unsuccessfully tried to persuade workers to adopt co-operative solutions. Six labourers in Tolpuddle, Dorset, attempted to found a friendly society and to seek to affiliate with the Grand National. This was discovered, they were convicted of swearing unlawful oaths, and they were sentenced to transportation for seven years. They became known as the Tolpuddle Martyrs and there was a large and successful campaign led by William Lovett to reduce their sentence. They were issued with a free pardon in March 1836.