Earlier quoted context omitted.
Is it "spying" for the government to remember information that he voluntary told to the government?
Did you even read the article? The government is actively sifting through his mail, more than 10 years after he was considered to be a threat... and a hippy environmentalist threat at that...
And guess what: the government has to "sift through your mail" to deliver it. All they're doing with him is remembering what they saw. Because he belonged to an organization that burned shit down.