Members of Congress investigating the activity of Amazon, Apple, Facebook, and Google say antitrust law reform is needed to “ensure that our economy remains vibrant and open in the digital age” and safeguard democracy. The findings comes from a document released today (PDF), the culmination of a 16-month long investigation carried out by the antitrust subcommittee, a part of the House Judiciary committee. The report concludes that although each of the companies maintain different kinds of monopolies, each effectively acts as a gatekeeper in digital markets today with the power to pick winners and dispose of competitors.