What was 19th and 20th century Utilitarianism?

[me]

What type of people followed Utilitarianism?
How did leaders try to gather support for it?
What were their political views?
What were their economic views?
What were social structures and changes they wanted?

[Spellbound]

Utilitarianism was the philosophy first described by Jeremy Bentham and James Mill, and later modified by Mill's son John Stuart Mill. The basics of it are that governance should be for the greatest good for the greatest number.
Bentham and the Mills wrote pamphlets and books outlining the theories, held philosophic debates and promoted their theories to influential government bodies - Bentham was involved in some prison design.
Their views are hard to quantify in modern terms, they were classical liberals, and advocated rights for women, but they resemble conservatives in other matters.
Economically they were liberals believing in the free market, but regulated to prevent harm to the majority.
As for social structures and changes - they wanted rulers to rule using the "hedonic calculus" to calculate whether or not each Act of Parliament would cause harm or not to the majority of the population.

See:
http://www.utilitarian.net/