Threatening with legal punishment for noncompliance doesn't work, and neither does appealing to patriotism.
Are you seriously asking why a branch of the the USA's government has less power outside of the USA?
if you consider the fact that the nsa and cia often collaborate closely, and then look at the amount of influence the cia has often displayed in the past, towards foreign countries/regimes etc., gejjaxxita's question seems quite reasonable.