As you mentioned, in the previous regime Iran had a great dependency on the United States. The CIA did a coup d'état and overthrew our national leader, Dr. Mosaddegh. For this reason the people of Iran, during the time of the Shah, were not agreeable to the United States. But this is no reason that, in the name of Islam, the government should oppress people. The government has misused or taken advantage of the name of Islam, to the extent that some of the high-ranking clergy in Iran are against what the government is doing. One of the high-ranking spiritual leaders of Iran who, unfortunately, passed away a few months ago, announced that this government is neither Islamic nor republic. Right now, a lot of the high-ranking officials or high-ranking religious leaders are against it. Unfortunately, they do not have any power and you do not hear them.
As a Muslim, as a practising Muslim, I can witness that these people are taking advantage of the name of Islam.