Denis Prager was one of the advocates of the immigration regime in the 60's (first Soviet aliyah) and late 80's early 90's (second Soviet aliyah) that allowed Jews from the Soviet Union to apply for asylum to the United States. The second Soviet aliyah was based on the idea that violent/systemic antisemitism was drastically increasing after the fall of the Soviet Union. Something that didn't actually happen when revisited by scholars decades later.

https://en.wikipedia.org/wiki/Student_Struggle_for_Soviet_Jewry