How can flies be eliminated from grass clippings not meant as compost piles?

Eliminating any decomposing animals or foods and removing the nitrogen-rich materials in question to the burn, compost or garbage pile are ways to eliminate flies from a pile of grass clippings not meant as a compost heap. The presence of the insects in question indicates that opportunities for feeding, mating, and sheltering are offered in attractively plentiful and secure ways.