... Policy Research CEPR, and the Institute for Policy Studies. There are several more listed on their site.
[2] Someone who's an actual "immigrant" (i.e., of the legal variety) already has a "clear path to citizenship". The ones who don't have that "clear path" are illegal aliens. Thus, they're trying to mislead by pretending that illegal aliens are "immigrants", when they aren't.
... even membership in the radical Institute for Policy Studies, an alleged Communist front organization. However, a search fails to turn up much beyond noise. If anyone has credible information - such as with contemporaneous news reports or IPS literature - please leave a comment.
More on IPS here and here (1977 Heritage Foundation report), supposed Clinton links here (also here)
And, this page...