According to The Wall Street Journal, the Justice Department has opened an investigation into egg prices, which have doubled in the past year. The department plans to establish whether egg producers have conspired to inflate prices or hold back supply.

The Justice Department has opened an investigation into the cause of soaring egg prices, including whether large producers have conspired to raise prices or hold back supply, according to people familiar with the matter.

Maine Foods and Rose Acre Farms have colluded to boost prices or limit supply.