About 26 years ago, Iran’s biggest female pop star left her homeland to tour internationally after years of being banned from publicly performing by the theocratic regime. But Googoosh, now 75, refuses to be silenced. In the face of the Iranian government’s deadly crackdown on protesters amid an internet blackout, the music icon on Tuesday became the latest prominent Iranian celebrity to call for widespread support of the country’s people. On Instagram, where Googoosh has 6.8 million followers, the singer posted a copy of a letter she wrote to President Donald Trump dated Jan. 12, in which she asked him to “act on the promise” he made to the Iranian people to help them. “Today, defenseless people inside Iran are crying out to you, asking for help as they face these ongoing crimes against humanity,” she wrote, adding that they have “endured poverty, blackouts, water shortages, censorship, imprisonment and mass emigration.” If they are silenced, we must speak Actor Arian Moayed It’s a plea echoed by many in the worldwide Iranian diaspora who find themselves …