Page History

You can see a list of the campaigns that are assigned to a specific category by going to Services > Email Marketing: Campaigns, clicking Categories and then clicking on the category name.

You can see a list of the subscribers of a specific category by going to Services > Email Marketing: Campaigns, clicking Categories, then clicking the Category of interest.  From the Category page, clicking Category Subscriptions (ex., Newsletter Subscriptions) will show you the current subscribers. They appear in a data table, which is able to be filtered and manipulated like any other data table in your account.