Leading global technology firms have called for "wide-scale changes" to US government surveillance.
Eight firms, Google, Apple, Facebook, Twitter, AOL, Microsoft, LinkedIn, and Yahoo, have formed an alliance called Reform Government Surveillance group.
The group has written a letter to the US President and Congress arguing that current surveillance practice "undermines the freedom" of people.
It comes after recent leaks detailed the extent of surveillance programmes.
"We understand that governments have a duty to protect their citizens. But this summer's revelations highlighted the urgent need to reform government surveillance practices worldwide," the group said in an open letter published on its website.
"The balance in many countries has tipped too far in favour of the state and away from the rights of the individual - rights that are enshrined in our Constitution.
Reports about government surveillance have shown there is a real need for greater disclosure and new limits on how governments collect information”
The move by the eight firms comes after whistle-blower Edward Snowden leaked information about surveillance carried out by the US government.
Mr Snowden, an ex-US intelligence contractor, leaked documents to the media highlighting the various methods used by agencies to gather information.
The leaks have pointed to agencies collecting phone records, tapping fibre-optic cables that carry global communications and hacking networks.
Members of the group said the revelations indicated that the extent of surveillance needed to be controlled.
"Reports about government surveillance have shown there is a real need for greater disclosure and new limits on how governments collect information," said Mark Zuckerberg, chief executive of Facebook, the world's biggest social networking firm.
"The US government should take this opportunity to lead this reform effort and make things right."
The scandal first came to light in June this year after the UK's Guardian newspaper published the first leaks by Mr Snowden.
Since then, there have been concerns over how much user data firms have been asked to share with the agencies.
In an attempt to allay such fears over data security, companies have called for permission to publish details of data requests by government agencies.
Earlier this year, Apple, Microsoft, Google and Facebook all revealed details about such requests.
Larry Page, chief executive of Google, said that security of users data was "critical" for firms, but added that the same had been "undermined by the apparent wholesale collection of data, in secret and without independent oversight, by many governments around the world".
The group called upon the government to give companies the rights to provide details of any such future data requests to their users,
"Transparency is essential to a debate over governments' surveillance powers and the scope of programs that are administered under those powers," it said.
"Governments should allow companies to publish the number and nature of government demands for user information. In addition, governments should also promptly disclose this data publicly".
(Source : BBC)
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