Shows how you can use the Force.com Desk.com API client to fetch labels from a specific case.

FetchingLabels.class

try {
  DeskClient client = new DeskClient(new Map<String, String>{
    'username'  => 'you@example.com',
    'password'  => 'your_password',
    'subdomain' => 'your_subdomain'
  });
    
  List<Object> labels = (List<Object>)client.getResource('cases').find(3368).get('labels');
  // get the count of the labels
  System.debug(labels.size());
  
  for (Object label : labels) {
    // get the string value of the label
    System.debug(String.valueOf(label));
  }
} catch(Exception e) {
  System.debug(e);
}