Temporary visas to work in the U.S., known as H-1Bs, have become highly controversial. Two U.S. senators are investigating how foreign companies are using the visas to bring workers into the country.

They suspect that Indian outsourcing firms are using H-1Bs to facilitate the outsourcing of American jobs. India's Infosys and Wipro received more of the visas in fiscal 2006 than any U.S. company.

Here's a look at how many of the visas they and other top Indian outsourcers used:

Employer	No. of H-1B visas
Infosys Technologies	4908
Wipro	4002
Tata Consultancy Services	3046
Satyam Computer Services	2880
Patni Computer Systems	1391
Larsen & Toubro Infotech	947
i-flex solutions	817
Tech Mahindra Americas	770
MphasiS	751

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