Spooner should be read and discussed far more widely. His arguments are carefully reasoned and logically flawless. "No Treason: The Constitution of No Authority", found herein, thoroughly dismantles the legitimacy of loyalty oaths to the State, the value of voting, and the Constitution itself, and if it can disabuse just one reader of the notion that "restoring the Constitution" is a goal worth pursuing he will have done his job.
On voting: "The secret ballot makes a secret government; and a secret government is a secret band of robbers and murderers." On oaths to the State: "of no validity", "destitute of obligation".
But Spooner is a largely unsung hero in several areas, from his practicing law in open defiance of occupational licensing, to his struggle against the Postal Service monopoly, and his inspiration of an anti-statist, direct action abolitionist movement against slavery. I agree that a multi-volume set of Lysander Spooner's collected works would be welcome.