code: func (s *OrganizationsService) ListBlockedUsers(ctx context.Context, org string, opt *ListOptions) ([]*User, *Response, error) {
  	u := fmt.Sprintf("orgs/%v/blocks", org)
  	u, err := addOptions(u, opt)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept header when this API fully launches.
  	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
  
  	var blockedUsers []*User
  	resp, err := s.client.Do(ctx, req, &blockedUsers)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return blockedUsers, resp, nil
  }
docs: // ListBlockedUsers lists all the users blocked by an organization.
  //
  // GitHub API docs: https://developer.github.com/v3/orgs/blocking/#list-blocked-users