Report by the Center for Constitutional Rights and Palestine Legal in September 2015 documents the widespread and growing suppression of Palestinian human rights advocacy in the United States. 2015.
Full PDF below, original post here: https://ccrjustice.org/the-palestine-exception
From the ACLU. https://www.aclu.org/blog/free-speech/rights-protesters/latest-attack-free-speech-israel-palestine-debate
See also this one: https://www.currentaffairs.org/2021/02/how-the-media-cracks-down-on-critics-of-israel