The CEOs of Amazon, Apple, Facebook and Google will testify before Congress Wednesday in what will be a crucial hearing for the future of both antitrust law and Big Tech’s relationship with Washington.

It will be the first time that Jeff Bezos, Tim Cook, Mark Zuckerberg and Sundar Pichai appear for questioning together and comes as the congressional panel hosting the hearing enters the final stretch of its investigation into digital marketplace competition.

For Democrats on the House Judiciary antitrust subcommittee, led by Rep. David Cicilline (D-R.I.), Wednesday’s testimony will be one of the last major components of that exhaustive process, which started in June 2019 and included hundreds of hours of calls, meetings and briefings, as well as the review of 1.3 million documents. No release date has been announced for the report.

A few Republicans on the subcommittee have signaled they will use the hearing to grill the nation’s top tech CEOs on content moderation, pursuing persistent yet unsubstantiated allegations that social media platforms discriminate against conservatives.

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Matt Stoller, director of research at the anti-monopoly organization the American Economic Liberties Project, told The Hill he hopes Wednesday’s hearing will give lawmakers a chance to press Bezos on Amazon Prime, which critics say the company is running at a loss to crowd out other marketplaces.