Examples from the U.S. economy where industries are not allowed to freely follow market forces?

It is rare that any business is allowed to follow market forces. For one thing the USA has paper money. That alone distorts economic signals needed by businessmen to make informed decisions. That is how the nation got "the roaring twenties", with balance restored by "the great depression". Public school teachers tell everybody that WW2 "pulled the country out of the depression", whereas any awake kid can see that war does not pull a country out of anything -- war only kills people and wastes resources. The people had to plant gardens to grow enough to eat; that is an indication of poverty, not being pulled out of depression.

The federal government has always regulated milk. In past times the government would buy milk to force the price up to a minimum level. All that milk was turned into butter and given to people drawing welfare. Those people had more butter than they knew what to do with, so they sold it to middle class people for cash. So the middle class had to work to pay taxes to buy butter for poor people who didn't work and didn't pay taxes. That program was eventually discontinued, but to this day small dairies still get raided by the FBI for various reasons. Freedom is forbidden in the dairy industry.

Railroads have always curried federal favor in many ways, and in return the government has piled on regulations until trains simply can't run any more. They have pulled up the rails and sold the ground.

You can get a lot of stories about this general subject for free at mises.org and if you want to take a class they offer those too.