code: public void deleteLabel(Serializable projectId, String name)
              throws IOException {
          Query query = new Query();
          query.append("name", name);
          String tailUrl = GitlabProject.URL + "/" +
                  sanitizeProjectId(projectId) +
                  GitlabLabel.URL +
                  query.toString();
          retrieve().method(DELETE).to(tailUrl, Void.class);
      }
docs: Deletes an existing label.
  
  @param projectId The ID of the project containing the label.
  @param name      The name of the label to delete.
  @throws IOException on gitlab api call error