https://arstechnica.com/tech-policy/2020/12/feds-say-facebook-broke-us-law-offering-permanent-jobs-to-h-1b-workers/

The United States Department of Justice sued Facebook on Thursday arguing that the social media giant discriminated against US workers by giving preference to Facebook workers on H-1B visas who wanted to transition to permanent jobs at the company.

The H-1B visa program lets foreign workers work at a US company for three years. It can be renewed once. After that, an employer can ask for permission to offer the immigrant a permanent job under the Department of Labor's PERM certification program. But the employer is supposed to first advertise the job to see if any Americans are available. Only if no qualified Americans apply can the job go to the immigrant.