If you don't care about what they look at on the web or you have other means of controlling web access, then this might be enough for you. (howtogeek.com)
This method is one of the most effective means of controlling a classroom. (av.qnet.com)
If he asks why did I not believe I will say the brain you gave me said that you were impossible and religion is just means of controlling people. (religion.blogs.cnn.com)