The Chartists were campaigners for political reform in the 1840s and 50s.
Although the franchise (the group of those entitled to vote) had been extended by a series of laws in 1832, at this period only men who owned or rented land of a certain value could vote for members of Parliament. This meant, in effect, that no working class males could vote. It was this that the Chartists were attempting to change, along with measures to make it possible for non-wealthy men to stand for Parliament.
The strikes and marches of the Chartist movement caused anxiety to the middle and upper classes who benefited from the political and social status quo. Tensions eventually led to arrests and military action against the Chartists and the movement fizzled out by the 1850s, having acheived none of their aims.