In the first in-person interview Edward Snowden has conducted since his arrival in Moscow in June, Barton Gellman reports:

Beginning in October 2012, he said, he brought his misgivings to two superiors in the NSA’s Technology Directorate and two more in the NSA Threat Operations Center’s regional base in Hawaii. For each of them, and 15 other co-workers, Snowden said he opened a data query tool called BOUNDLESSINFORMANT, which used color-coded “heat maps” to depict the volume of data ingested by NSA taps.

His colleagues were often “astonished to learn we are collecting more in the United States on Americans than we are on Russians in Russia,” he said. Many of them were troubled, he said, and several said they did not want to know any more.

“I asked these people, ‘What do you think the public would do if this was on the front page?’ ” he said. He noted that critics have accused him of bypassing internal channels of dissent. “How is that not reporting it? How is that not raising it?” he said.