The latest lawsuit was filed on August 2 in federal court for the Northern District of California by Satya Dev Tripuraneni, who worked for Infosys for five years in California.

Tripuraneni alleged that he faced harassment and had to quit his job after he reported visa fraud by managers at Infosys.

According to Palmer, when the US State Department began to limit the number of H-1B visas, Infosys began using another type of visa, the B-1.

B-1 business visas are intended for short-term uses, such as consulting with business associates, attending business conventions or negotiating contracts. H-1B visa, on the other hand, is a non-immigrant visa, which allows US employers to temporarily employ foreign workers in speciality occupations.

Infosys has already received a "subpoena" from a Grand Jury in the US District Court for the Eastern District of Texas to provide certain documents and records related to the company's sponsorships for, and uses of, B1 business visas.

A subpoena is a writ issued by a court of justice requiring a person to appear before the court at a specified time.

Palmer also alleged that Infosys had subjected him to harassment and retaliation, which Infosys has so far denied.

Earlier this year, Infosys had informed US market regulator SEC that in the event that "the US government undertakes any action which limit the B1 business visa programme or other visa programme that we utilise, this could materially and adversely affect our business and results of operations".