Most H-1B workers are paid less, but it depends on the type of job: AP

Cheap foreign labor.

Importing foreign workers who harm the wages or working conditions of American workers similarly employed is illegal under Tilte 8 of US law. That means millions of these H-1B workers are here working illegally.

https://apnews.com/article/archive-immigration-h-1b-visa-politics-873580003

https://www.law.cornell.edu/uscode/text/8/1182