India was called "the jewel in the imperial crown" because it was extremely valuable to Great Britain. From resources to new trading opportunities, Britain's control of India greatly helped them.
I can answer the second part the men that controlled them paid very little lots of work hours and no vacations so they made a lot of money while the people made very little
Karl Marx proposed communism as a solution to the problems created by the Industrial Revolution in his work The Communist Manifesto, along with Friedrich Engels.
