How best to contribute to anti-facist efforts as an engineer?

> Sanders defended his vote by suggesting that the guest worker provisions in the bill were “akin to slavery,” a notable shift from how Sanders talked about immigrant labor before his presidential bids.

The "before his presidential bids" quote from 2007 says the same:

> “If poverty is increasing and if wages are going down, I don’t know why we need millions of people to be coming into this country as guest workers who will work for lower wages than American workers and drive wages down even lower than they are right now,”

In both cases he singles out "guest workers" as the issue, and not the broad category of "immigrants."

This includes guest workers who work under an H1B visa which, quoting https://en.wikipedia.org/wiki/H-1B_visa:

> has been criticized for potentially subsidizing businesses, creating conditions likened to modern indentured servitude, institutionalizing discrimination against older workers, and suppressing wages within the technology sector. Economists and academics remain divided on the program's overall effect, including its effects on innovation, U.S. workers, and the broader economy

As for your policy advice, do bear in mind that the last three Democratic presidents have been anti-immigration.

Clinton's Illegal Immigration Reform and Immigrant Responsibility Act of 1996 was part of his "triangulation" to attract anti-immigrant sentiment and take the wind out of the sails of Republicans.

Obama was nicknamed the "Deporter in Chief", and Biden was little different, while keeping most of Trump's changes, and even recently boasting about his deportation counts compared to Trump (II).

In other words, the Democratic Party has already implemented your suggestion, only to find that it didn't cause enough people to switch parties, while causing them to lose support due to the apathy and resignation by those who think the current laws are far too cruel and inhumane.

The Jammu and Kashmir Reorganisation Act, 2019 in [3] could also be described as the right's willingness to suppress minority rights and autonomy.

Nor is there need to point to India: the left tends to support Native American tribal sovereignty, rather than the older expansionist practices of taking over Native land in the name of explicit demographic change.