The leaders of the four biggest and most powerful tech companies will testify before the House Judiciary Antitrust Subcommittee in a hearing on Monday, July 27. Facebook CEO Mark Zuckerberg, Amazon CEO Jeff Bezos, Google CEO Sundar Pichai, and Apple CEO Tim Cook are all expected to speak. The Silicon Valley titans will testify on the issue of antitrust and whether their companies are monopolies. Some politicians on both sides of the aisle have been moving to break up Big Tech for years, and this hearing could very well be the start of concrete action.  SUBSCRIBE FOR THE LATEST VIDEOS VISIT DIGITAL TRENDS In our studio: BDI Corridor Media Console: Music: Digital Trends may earn a commission when you buy through links on our channels. FOLLOW US!