According to C. Wright Mills, President Donald Trump, Bill Gates, and a CEO of a large company are all members of the

Power Elite

Explanation:

As a modern masterpiece of social science and social criticism, The Power Elite was first published in 1956.

C. Wright Mills explores and criticizes the power hierarchy in the United States, attracting attention to three closely interlocking power branches: the military, business, and political elite.

The Power Elite could be perused as a good summary about what was going on in America when it was published, however today its underlying question of whether America is as democratic as it is in practice remains very important.