Corn Law

The Corn Laws were measures enforced in the United Kingdom between 1815 and 1846, which imposed restrictions and tariffs on imported grain. They were designed to keep grain prices high to favour domestic producers. The laws did indeed raise food prices and became the focus of opposition from urban groups who had far less political power than rural Britain. The Corn Laws imposed steep import duties, making it too expensive to import grain from abroad, even when food supplies were short. The laws were supported by Conservative landowners and opposed by Whig industrialists and workers. The Anti-Corn Law League was responsible for turning public and elite opinion against the laws, in a large, nationwide middle-class moral crusade with a Utopian vision.

The first two years of the Irish famine of 1845–1852 forced a resolution because of the urgent need for new food supplies. Prime Minister Sir Robert Peel, a Conservative, achieved repeal with the support of the Whigs in Parliament, overcoming the opposition of most of his own party.

"" included any grain that requires grinding, especially wheat. The laws were introduced by the Importation Act 1815 (55 Geo. 3 c. 26) and repealed by the Importation Act 1846 (9 & 10 Vict. c. 22). The laws are often considered examples of British mercantilism.

The economic issue was food prices. The price of grain was central to the price of the most important staple food, bread, and the working man spent much of his wages on bread.

The political issue was a dispute between landowners (a long-established class, who were heavily over-represented in Parliament) and the new class of manufacturers and industrial workers (who were under-represented). The former desired to maximise their profits from agriculture by keeping the price at which they could sell their grain high. The latter wished to maximise their profits from manufacture by reducing the wages they paid to their factory workers—the difficulty being that men could not work in the factories if a factory wage was not enough to feed them and their families; hence, in practice, high grain prices kept factory wages high also.

...
Wikipedia