What is Betar US, the group pushing to deport pro-Palestinian students?

The far-right Zionist group is one of many supporting calls by Trump to deport pro-Palestine students from the US.

https://www.aljazeera.com/news/2025/3/25/what-is-betar-us-the-group-pushing-to-deport-pro-palestinian-students?traffic_source=rss