The types of commentary and controversy presented in science fiction films often illustrate the particular concerns of the periods in which they were produced. Early science fiction films expressed fears about automation replacing workers and the dehumanization of society through science and technology. For example, "The Man in the White Suit" (1951) used a science fiction concept as a means to satirize postwar British "establishment" conservatism, industrial capitalists, and trade unions. Another example is "HAL 9000" from "" (1968). He controls the shuttle, and later harms its crew. "Kubrick's vision reveals technology as a competitive force that must be defeated in order for humans to evolve." Later films explored the fears of environmental catastrophe, technology-created disasters, or overpopulation, and how they would impact society and individuals (e.g. "Soylent Green", "Elysium").