Why does the central intrlligence Agency have more freedom of action than other federal agencies?

The Central Intelligence Agency (CIA) was established after President Truman signed the National Security Act of 1947, which also created the National Security Council. The purpose of the CIA is to covertly obtain intelligence from foreign countries, thus the CIA is given a great deal of freedom so that they can collect the intelligence without having to expose the United States's involvement in any covert operations. In addition, in 1948 the National Security Council issued a directive known as NSC 10/2, which gave the CIA even greater freedom and discretion to conduct clandestine operations in order to obtain vital intelligence for the US government.