I suggest you read this link...very very general, but may help you understand the uproar.
"The Five Eyes, often abbreviated as FVEY, is an intelligence alliance comprising Australia, Canada, New Zealand, the United Kingdom and the United States. These countries, all Anglophone and ruled by a common law legal system, are bound by the multilateral UKUSA Agreement, a treaty for joint cooperation in signals intelligence.[1][2][3]"
Five Eyes - Wikipedia