The heads of the world's largest technology companies have appeared before the US Congress, accusing them of using their power to crush their rivals.
Amazon's Jeff Bezos says the world needs big companies, while the heads of Apple, Facebook and Google say their companies have introduced "innovation."
The leaders appear before Congress at a time when US lawmakers are considering tougher legislation and are investigating market competition.
Critics of companies believe that companies should be divided.
Members of the Democratic Party raised issues of market competition, while members of the Republican Party asked questions about how these companies handle information and whether they have perpetuated conservative views.
David Cecilian, a congressman and leader of the Democratic Party's congressional committee on the issue, said a year-long investigation had found that online platforms had used their power in a destructive manner. So that they can capture the market.
He said that he was convinced that these companies run a monopoly system and he thought that the government should do something about it.
"Some companies will have to do shares and all will have to apply the rules," he said.
Facebook's Mark Zuckerberg, Amazon's Jeff Bezos, Google's Sundar Pachai and Apple's Tim Cook all insisted they didn't do anything illegal, citing the American structure and values of companies.
What are the concerns of big technology companies?
Members of Congress have accused Google of stealing apps created by rival smaller companies to keep users on their websites.
In addition, Amazon's dealings with sellers on its website, Facebook's buying of competitors such as Instagram and Apple's App Store were all discussed.
David Cecilian said that there is a fundamental tension of interest in Amazon because it hosts merchants of certain goods and provides the same goods themselves. The European Union has also raised questions about Amazon's practice.
"Amazon's dual role is fundamentally against market competition, and Congress needs to do something about it."
However, some Republicans said they did not agree to share in the companies, nor did they agree to significant changes in market competition laws in the United States. A member of the committee said that being a big company is not a bad thing in itself.
His focus was on ensuring that political bias in these companies did not suppress conservative views.
"I think the big tech companies want to get rid of the Conservatives," said Congressman Jim Jordan.
What do companies say?
Presenting the video link, the heads of these companies defended their companies, saying that their companies support small businesses and that they were at risk from new competitors entering the market.
Apple's Tim Cook said the business environment was so competitive that "there's a street fight going on to gain a foothold in the smartphone market."
Jeff Bezos said there is no conflict of interest in his company, but acknowledged that his company was reviewing how small vendors' information was being used on its platform.
The company is accused of using the information to introduce popular products.
Jeff Bezos said Amazon's rules do not allow its employees to view the data of an individual company, but said it was possible that staff had violated the policy. "We are investigating," he said.
In his speech, Jeff Bezos said that Amazon is at risk from companies like Wal-Mart and for many years when he started working in various businesses, he suffered a lot.
"I love garage entrepreneurs ... I was one such entrepreneur myself. But just as the world needs small companies, so does the world need big companies. There are some things that small companies can't do. "
What does Donald Trump have to say?
US President Donald Trump has been a critic of Amazon for many years and has even threatened action against it. He had said on Twitter that "if Congress does not bring the big technology companies to justice as they should have done many years ago, I will do so myself through presidential decrees."
He also said that the White House would follow up on this progress in Congress.
"There is no doubt that big technology companies are doing a bad job," he said.
In this regard, technology analyst Dan Ives says that although there is a "hoof" against technology companies in Washington, it is unlikely that Congress will be able to agree to do anything about it.
He believes that legislation is the only way to fix these companies. "Without legislation, there will be no significant change, but we will be keeping a close eye on companies' purchases in the future," he said.