Mass remove role for users (not auto provisioned)

Summary:

I want to remove roles from a list of users where acces were granted manually (not auto provisioned). How can I do this.

Content (required):

For example, I have 500 employee for which I would like to remove Customer Relatioship Management Application Administrator.

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):