I believe "purged" here means primaried or threatened to primary. I'm sure you know of certain famous examples. Here are some recent headlines:

https://www.scrippsnews.com/politics/president-trumps-first-...

https://www.cnn.com/2025/04/06/politics/cornyn-texas-senate-...

This list will contain more examples:

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