The protest document is urging readers to assert their opposition to the draft.
It views conscription (forced enrollment in the military) as a transgression of the citizens' rights protected by the Constitution. That is why the document asks people to resist the draft ("Do not submit to intimidation") because if they consent, they are also part of the problem. Submitting and being silent about their rights would mean that they are encouraging freedom violation: "If you do not assert and support your rights, you are helping to deny or disparage rights."
