BUREAU OF CUSTOMS EMPLOYEES ASSOCIATION (BOCEA), REPRESENTED BY ITS NATIONAL PRESIDENT MR. ROMULO A. PAGULAYAN, PETITIONER, VS. HON. ROZZANO RUFINO B. BIAZON (IN HIS CAPACITY AS COMMISSIONER, BUREAU OF CUSTOMS), HON. CESAR V. PURISIMA (IN HIS CAPACITY AS SECRETARY OF FINANCE), HON. MAR A. ROXAS (IN HIS CAPACITY AS FORMER SECRETARY OF THE DEPARTMENT OF TRANSPORTATION AND COMMUNICATIONS), HON. JOSEPH EMILIO A. ABAYA (IN HIS CAPACITY AS INCUMBENT SECRETARY OF THE DEPARTMENT OF TRANSPORTATION AND COMMUNICATIONS), RESPONDENTS