To get rid of people from an organisation because you do not agree with them. (Cambridge Dictionary)
Rid (someone) of an unwanted feeling, memory, or condition. (Oxford Dictionaries)
To clear of guilt. (Merriam – Webster)
To free from moral or ceremonial defilement. (Merriam – Webster)
To purge an organisation of its unacceptable members means to remove them from it. You can also talk about purging people from an organisation. (Collins Dictionary)
Purging…. Causes and Solutions.
Purging information that is no longer needed.
Purging is the process of removing data from your company file.