you might also check this via the GUI under Administration > Issues > Permission schemes and check every permission with Strg + F searching for the certain group.
You should also consider, that the group could be part of validators, postfunctions etc. which are used in workflows.
SELECT PS.name AS PermissionSchemeName,SP.perm_parameter AS GroupName, SP.permission_key AS Permission FROM schemepermissions SP INNER JOIN permissionscheme PS ON SP.scheme = PS.id Where SP.perm_parameter = 'certain-group-name';