Let me be clear: Lab heads explicitly refer to foreign students/postdocs as “Slave Labor”!! I have this on audio, *repeatedly*, from interviews with leading biologists I conducted years ago for @ASCBiology.
Let me tell you what would likely happen in the absence of visa access. Salaries would go up & US blacks/women/minorities would be hired more.
Also, labs could shrink. Taxes might rise.
It’s real life folks. Not a good cry.