The US Department of Justice accused Facebook of discriminating against American workers by giving hiring preferences to immigrants.
A lawsuit alleges the social media firm refused to recruit, consider or hire qualified and available Americans for over 2,600 positions. Those jobs instead went to foreigners on temporary visas.
Facebook disputed the allegations, but said it was co-operating with the department.
The lawsuit concerns Facebook’s use of temporary H-1B visas, which are often used by tech companies to bring highly skilled foreign workers to the US.
In its lawsuit, the department alleged that Facebook “intentionally created a hiring system” that favored H-1B visa holders and other temporary workers over Americans.
The department said it filed the lawsuit after a two-year investigation into Facebook’s hiring practices.
The lawsuit seeks “back pay on behalf of US workers denied employment at Facebook” among other remedies.