During the cultural revolution, why were people sent to “re-education” camps?

During the Cultural Revolution, bourgeois intellectual were sent to re-education camps to be taught in a communist ideology. Many of them were teachers and professors in charge of the education of the common people. But their ideology didn't match the communist one, so they were sent to these camps to be taught how was like to be a peasant or a common person who had to work hard to survive. This movement despised intellectual labor and valued hand labor.

Intellectual were sent to re education camps to taught in a communist ideology.  

At the time of cultural revolution, bourgeois intellectual were sent away to the re-education camps to be taught as into the communist ideology. Some of them were teachers and some of them were professors who are in charge of the education for the support of common people. But they had the ideology that did not match the communist one.

sonar maybe? ? i dont know the choices