The Groups page under "My Contacts" allows you to easily manage your contacts with your campaigns. 

It shows you the number of contacts in each group and the number of campaigns launched with that group.

You can also choose to subscribe the group to a campaign or export the list of its contacts. 

Viewing Singular Groups

You can select the "View" button to access a specific group from here. Upon entering that group's page, you will find a comprehensive list of all your contacts within Snappy Kraken.;

You can click the checkbox to "Show Members only" or select "+Join" to add new contacts to the group.