Alphabet Inc.’s Google lost the biggest antitrust challenge it has faced this summer when a US judge found that it illegally monopolized the search market. Now it’s facing the possibility that the result will be a forced breakup of the company.

For the first time since AT&T was dismantled into Baby Bells four decades ago, the US government is weighing the breakup of one of the world’s largest and most consequential monopolies: Google.

The U.S. Department of Justice is considering asking a federal judge to force Google to sell parts of its business in order to eliminate its online search monopoly.