Indian outsourcing giant Infosys Technologies has found itself slapped with a second case in US courts over harassment stemming from alleged abuses of US work visas.

A former Infosys account manager filed a lawsuit against the company on 2 August in US district court for the northern district of California. According to Satya Dev Tripuraneni, who worked for Infosys for about five years, he was harassed for blowing the whistle on misuse of US visas.

Infosys spokeswoman Sukanya Ghosh said yesterday that the company was investigating all his claims.

The charges are similar to those another employee who filed a lawsuit in 2011 alleging harassment after alerting Infosys managers to visa abuses.

''We categorically deny any allegation or assertion that there is or was a corporate policy of evading the law in connection with the B-1 Visa program,'' Ghosh said by email.

''Our position is the same now as it has been from the beginning. We have not retaliated against any employee for bringing any suspected incident to the company's attention and we look forward to addressing this matter soon in open court.''

Employment visas have become a politically hot issue in the US, especially as those related to Indian IT services companies are seen to be taking jobs away from Americans. The issue has gained added traction in a presidential election year.

"Shortly after Tripuraneni filed his complaint with the Infosys whistleblower team, per our policy, the company launched a comprehensive investigation of his allegations. That investigation is continuing," Infosys said in a statement emailed to Reuters.

"As for comments on the legal matter, we are choosing to concentrate our attention and resources on the investigation," it added.

According to Tripuraneni's lawsuit, Infosys billed clients fraudulently for workers brought from India and also charged clients for taxes over and above the required charge.

The lawsuit comes after a US employee said he suffered retaliation after pointing out what he said was the misuse of US B1 visas.

That case, brought by Jack Palmer, an employee in Montgomery, Alabama, against the Bangalore-based company, is set to go on trial on 20 August. Infosys has denied there had been any wrongdoing in the case.

B1 visas are meant for use by companies to send their employees to the US for short-term business purposes

Earlier this year, Infosys said it was under investigation in Texas over its sponsorship and use of short-term US business visas.