From their own site..

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WHAT IS A THREE PERCENTER?

Being a Three Percenter is a way of life, not a club to join. To be a “three percenter” means to be a patriotic citizens who loves his country, his freedoms, and his liberty. It also means you are committed to standing against and exposing corruption and injustice. As a three-percenter club, it means more specifically we support the fight to ensure the rights of motorcyclists are not infringed, ignored or abused by new laws or unjust persecution, and any existing laws which violate fundamental rights of American citizens are campaigned against. Three Percenters are NOT anti-government. In fact they are pro-government, so long as the government abides by the Constitution, does not overstep its bounds, and remains “for the people and by the people”.

WHY THREE PERCENT?

In the mid-1700’s, the British colonies of North America were oppressed by the British Empire and the ruling class in England. An ideology spread identifying and acknowledging every person has — from birth — certain inalienable rights. The limitation or denial of these rights is defined as tyranny and oppression. Eventually, the colonies’ “Minutemen” were formed and trained to fight against that tyranny whenever it arrived at their doorstep. It is estimated that only 3% of the original colonists actively fought in the field against British forces at any given time, thus the name Three Percenter; a person who, even today, abhors and will stand against tyranny and any governmental overreach into the liberties afforded every American citizen.
WHAT THREE PERCENTER MEANS TO US

In watching and reading the news recently, the Three-Percenter message has regrettably become corrupted by some. We feel it necessary to make clear what the Countrymen MC means when we speak of our shared, 3%er philosophy.

Countrymen MC is not an extremist or anti-government group. It is also not affiliated with any one political party or portion of the political spectrum. Like America, and the military who protects her, our members come from all backgrounds, and come together to support each other and military veterans in need — that is our mission.

Our interpretation of the Three-Percenter philosophy is to hold government accountable; particularly when life, liberty, and the pursuit of happiness are threatened by those elected to govern or employed to serve. To stand up against and expose corruption and injustice is an act independent of political party affiliation, race, color or creed, and – we believe – the duty of every American.

http://countrymenmc.org/three-percenter/