From page 3 of Labor Relations Law with Notes and Comments, 2012 Edition by Salvador A. Poquiz:
At first glance my immediate question was: what national interest is under compulsory arbitration here? Until I realized that this was a case of a misplaced modifier.
Under the Legal Writing class of Prof. Gallardo A. Escobar, Jr., a student would have rewritten it this way:
However, the government plays an active role when it directly intervenes under compulsory arbitration in the resolution of a labor conflict that affects an industry indispensable to national interest.
