How can I get rid of the...

There’s no good control for these mushrooms, which spread in circles from an underground fungus. You can remove the mushrooms, temporarily at least, by mowing or raking them. Apply low doses of nitrogen to your lawn on a regular basis. This will increase soil fertility and may create a hostile environment for mushroom regrowth. By the way, these patterns of growth are known as fairy rings because it was once thought that they marked the paths of dancing fairies.