Fending off accusations of stifling competition, four Big Tech CEOs answered for their companies' practices before Congress as a House panel caps its yearlong investigation of market dominance in the industry. Facebook's Mark Zuckerberg, Amazon's Jeff Bezos, Sundar Pichai of Google and Tim Cook of Apple sought to defend their companies amid intense grilling by lawmakers. The CEOs confronted a range of other concerns about alleged political bias, their effect on U.S. democracy and their role in China. The four CEOs were testifying remotely to lawmakers, most of whom were sitting, in masks, inside the hearing room in Washington. Pichai, CEO of both Alphabet & Google, took the most heat from conservatives on the House of Representatives Judiciary Committee's antitrust, he repeatedly told lawmakers he would be happy to look into various situations and get back to them. Watch the video to know more.