Delete spam users in Bbpress?

I just noticed many spam forum posts in my bbpress forum. I started marking them as spam (one at a time, because there’s no way to bulk spam them), but then realized I should delete the users that created the spam forum posts, because I wasn’t sure if WordPress will prevent them from posting again if their content is marked as spam. I quickly realized that I have pages & pages of these spam posts, and it was taking very long to do each one. Can anyone please recommend a faster way to accomplish this? I can only identify the users as spammers by looking at the forum post title within the “topics” tab of bbpress.

Thanks in advance