In another major legal blow to Google, a federal judge on Thursday ruled that the search giant held an illegal monopoly over some advertising technology.

A US judge on Thursday ruled that Google illegally wielded monopoly power in the online ad technology market, in a legal blow that could rattle the tech giant's revenue engine.The federal government and more than a dozen US states filed the antitrust suit against Alphabet-owned Google,

Google has illegally built “monopoly power” with its web advertising business, a federal judge in Virginia has ruled, siding with the Justice Department in a landmark case against the tech giant that could reshape the basic economics of running a modern website.