Secretary of State John Kerry went to Europe to talk about Mideast peace, Syria and Iran. What he got was an earful of outrage over U.S. snooping abroad. President Barack Obama has defended America's surveillance dragnet to leaders of Russia, Mexico, Brazil, France and Germany, but the international anger over the disclosures shows no signs of abating in the short run. Longer term, the revelations of tactics that allegedly include tapping the cellphones of as many as 35 world leaders threaten to undermine U.S. foreign policy in a range of areas. This vacuum-cleaner approach to data collection has rattled allies.