Edward J. Snowden, the former National Security Agency contractor who leaked a trove of documents revealing the agency’s surveillance operations, said he raised his concerns to more than 10 officials, “none of whom took any action to address them,” before he decided to give the documents to journalists…

“Everyone in the intelligence community is aware of what happens to people who report concerns about unlawful but authorized operations,” he wrote.

Other people, he said, told him to “let the issue be someone else’s problem.”

“Even among the most senior individuals to whom I reported my concerns,” he continued, “no one at N.S.A. could ever recall an instance where an official complaint had resulted in an unlawful program being ended, but there was a unanimous desire to avoid being associated with such a complaint in any form.”