The people of Iran have known this since the fifties...
In August 2013 the CIA admitted that it was involved in both the planning and the execution of the 1953 Iranian coup d'état, including the bribing of Iranian politicians, security and army high-ranking officials, as well as pro-coup propaganda. The CIA is quoted acknowledging the coup was carried out "under CIA direction" and "as an act of U.S. foreign policy, conceived and approved at the highest levels of government." (See Operation Ajax.)
The United States of America overthrew the democratically elected Prime Minister of Iran to counter his nationalization of the oil industry. The developing democracy of Iran was halted, Iran's greatest resource was exploited by foreign oil companies (USA and BP) for more than 25 years and in 1979 the revolution against the (USA's) Shah of Iran created the Islamic state it is now.
But wait, there's more...
In 2005 it was reported that President George W. Bush authorized the CIA to undertake black operations against Iran in an effort to destabilize the Iranian government. Unnamed administration officials were reported as saying the State Department was also studying dozens of proposals for spending $3 million in the coming year "for the benefit of Iranians living inside Iran" including broadcast activities, Internet programs and "working with people inside Iran" on advancing political activities there.In 2006, the United States congress passed the Iran Freedom and Support Act, which directed $10 million towards pro-democracy groups opposed to the Iranian government. In 2007, President Bush authorized a $400 million covert operation to create unrest among the Iranian government that was "designed to pressure Iran to stop its nuclear enrichment program and end aid to insurgents in Iraq". The CIA has also provided support to a militant Sunni organization called Jundullah, which has launched raids into Iran from its base in Pakistan to possibly sabotage Iran's nuclear components.
This is all common knowledge to Iranians and the world.