Definitions and a website: Luddites

From the Encyclopedia Brittanica: Luddite

member of the organized bands of 19th-century English handicraftsmen who rioted for the destruction of the textile machinery that was displacing them. The movement began in the vicinity of Nottingham toward the end of 1811 and in the next year spread to Yorkshire, Lancashire, Derbyshire, and Leicestershire.

The "Ludds," or Luddites, were generally masked and operated at night. Their leader, real or imaginary, was known as King Ludd, after a probably mythical Ned Ludd. They eschewed violence against persons and often enjoyed local support. In 1812 a band of Luddites was shot down under the orders of a threatened employer named Horsfall (who was afterward murdered in reprisal). The government of Robert Banks Jenkinson, 2nd Earl of Liverpool, instituted severe repressive measures culminating in a mass trial at York in 1813, which resulted in many hangings and transportations. Similar rioting in 1816 was caused by the depression that followed the Napoleonic Wars; but the movement was soon ended by vigorous repression and reviving prosperity.
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You should also check out http://www.luddites.com/ - Luddites online are an interesting oxymoron.

-- Adele