Alphabet's Google broke the law with an illegal monopoly on online search, a federal judge ruled on Monday, the first big win for U.S. antitrust authorities who have filed several lawsuits challenging Big Tech's market dominance. The ruling paves the way for a second trial to determine potential fixes, possibly including a breakup of Alphabet, that would change the landscape of the online advertising world that Google has dominated for years. It is also a green light to aggressive U.S. antitrust enforcers prosecuting Big Tech, which faces criticism from across the political spectrum.