CIA before and during the Cold War

During World War II, a secret intelligence agency known as the Office of Strategic Services controlled the flow of the war by collecting foreign intelligence and training special-operation soldiers. This was also the beginning of espionage. After the war, the OSS was dismantled. Many secret agencies were created and put down, but the Central intelligence agency was finally created under the National Security Act of 1947. They were responsible for discovering intelligence, securing its validity and deciding the level of national security.
During the Cold War, President Eisenhower gave the CIA 46 million dollars to provide America with information of the Soviet Union. The CIA supported the invasion of Cuba by providing training to the locals. They also discovered the Soviet missiles in Cuba. From the 1950s to 1970s, the CIA operated AirAmerica, a cargo and passenger airline company, to allow access to areas in Asia. However, they were suspected of being involved with the opium trade in China which eventually caused the operation to be suspended. The CIA continued to control the underground of America and remained as secretive as possible.