View photos(Bloomberg) — U.S. technology giants are headed for their biggest antitrust showdown with Congress in 20 years as lawmakers and regulators demand to know whether companies like Alphabet Inc.’s Google and Facebook Inc. use their dominance to squelch innovation.Executives from Google, Facebook, Apple Inc. and Amazon.com Inc. are set to appear Tuesday before the House antitrust panel, whose Democratic chairman is leading an investigation into the market power of the biggest tech companies and their effect on competition.The hearing harkens back to Microsoft Corp. co-founder Bill Gates’ appearance before the Senate in 1998 when Microsoft was the target of government scrutiny into its monopoly in computer operating systems. Two months later, the Justice Department filed a landmark antitrust lawsuit against Microsoft that reined

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