I had a comment, but I think the tide has passed the point where there is any value or wisdom in speaking against the intelligence agencies.
The intel agencies of different countries act as checks and balances against each other, to some degree. In some countries there are enough different intel agencies that they act as checks and balances against each other.
However, the voice of the public is a great additional check on their behavior, especially when amplified by mainstream media and social media. Our elected officials want to be re-elected. Many will change their tune if they feel there is enough outcry that it might affect their poll numbers. And this is the only legal way to effect change in many countries.