They can do it through peaceful means, not violence against citizens.
Most of the time, they can do it peacefully ... usually they do.
Sometimes they can’t do it through peaceful means. There is a lot of corruption in the IRS ... but there are also a lot of people that intentionally evade taxes or ignore tax laws, and some that violently resist collection. When met with violence, a guy with a briefcase won’t due.
SnakeDoc