I seem to remember that when American air traffic controllers went on strike Reagan fired the lot of them and brought in military personel as a temporary measure. All Israeli airports, ports and railways are strategic assets should be covered by a no strike agreement. If the workers strike fire them and replace them with new people. Pay a good salary with full benefits but make it legally binding that striking is not an option and in times of national emergency workers will be obliged, if necesssary, to work around the clock and endure any danger that occurs.
Military police vehicle attacked by rioters overnight in ultra-Orthodox area of Ashdod (Haaretz)
from the article: Histadrut announces general strike to begin Wednesday at 6 A.M.