Why were people unhappy about the society in Iran in the 1960s and 1970s?

People were unhappy about the society in Iran in the 1960's and 1970's because Iran had been ruled by a man named Shah, who ruled through a secret police force. was a strict leader that had many Iranians jailed, tortured, and executed. Shah's policies weren't well received by some of the Iranian people because they believed his policies were too western and went against the teachings of Islam. Some people think that the Ayatollah chose to free the hostages on January 20th, 1981 because it was Ronald Reagan's first day in office and that it would make Jimmy Carter and the Democrats feel silly because they weren't able to negotiate the release of the hostages.