Teachers went on strike in central Iran’s city of Yazd. Steelworkers and hospital staff walked off the job in the southwest city of Ahvaz. Railway employees protested near Tabriz. And a bus drivers union in Tehran battled the private companies that control many city routes. These were among the hundreds of recent outbreaks of labor unrest in Iran, an indication of deepening discord over the nation’s economic troubles. Workers are turning not only against their employers but also Iran’s government, piling pressure on leaders who promised but failed to deliver better times in the two years since economic sanctions were lifted in the nuclear deal. The strain would likely only worsen if President Donald Trump decides to pull the U.S. out of the deal. He has said he would announce a decision by Saturday, and such a move would return sanctions to an Iranian economy already on the ropes. […]