> The problem there isn't immigration, it's exploitation of workers.

Which is made easier by immigration. In addition to the simple law of supply & demand, it also impedes unionization:

Whole Foods' heat map says lower rates of racial diversity increase unionization risks - https://www.businessinsider.com/whole-foods-tracks-unionizat...

Immigrants Reduce Unionization in the United States - https://www.cato.org/blog/immigrants-reduce-unionization-uni...

Racial Diversity and Union Organizing in the United States, 1999–2008 - https://journals.sagepub.com/doi/10.1177/0019793915602253

Amusingly, the ComputerWeekly article (citing the Business Insider article) omits the direction in which diversity affects unionization risk [1], while the two wikipedia articles (again citing the same Business Insider article) [2,3] strongly imply that diversity increases unionization, so the opposite of what their source is saying!

[1] These “risk scores” are calculated from over two dozen metrics – including employee “loyalty”, turnover, racial diversity, “tipline” calls to human resources and proximity to a union office – and shows the likelihood of employees in that location forming or joining a union. - https://www.computerweekly.com/news/252481961/Amazons-Whole-...

[2] Factors including racial diversity, proximity to other unions, poverty levels in the surrounding community, and calls to the NLRB were named as contributors to "unionization risk." - https://en.wikipedia.org/wiki/Criticism_of_Amazon#Opposition...

[3] Factors including racial diversity, proximity to other unions, poverty levels in the surrounding community and calls to the National Labor Relations Board were named as contributors to "unionization risk". - https://en.wikipedia.org/wiki/Amazon_and_trade_unions