Oliver Twist and The signalman

In the short story "The signal- man and the movie "Oliver Twist", I could find a lot of interesting themes like: Fear, Working class, Poverty and Power. Both present how people in those days had feared because they did not know what is going on with their jobs, society, and the most important with their own life. In fact, in this time people, especially women and children, became to work in different places with lower salaries. They were exposed to die or have some work accident because they had not enough to work in.
However, power is another important theme. I could see how people woh had power could take advantage of poor people, especially children who did not have parents. In effect, rich people could abuse of their power with people who had not any education of something. But, power and rich people were and will be taking advantage of lower social class.