Thanks to the foresight of those who framed our Constitution, public protest has become a key component of our democratic process, a means by which the people can make their voices heard and effect real, even historic, change. The right to assemble played a crucial role in the women's suffrage, civil rights, and antiwar movements, to name just a few. Still, in each of those instances, mobilized citizens had to contend with powerful, entrenched forces who fought back aggressively and did whatever they could to stifle these movements and preserve the status quo.

This same struggle is playing out again today. As the American and global communities grapple with the mounting climate catastrophe, the fossil fuel industry is holding nothing back in its attempt to silence its critics and those who assemble to protest their destruction of our shared climate. In a surprising number of states, antidemocratic legislation is being pushed through state legislatures with the backing of fossil fuel companies, conservative think tanks, and industry-tied mega-donors.

In March, Governor Kristi Noem of South Dakota signed legislation to usher in a new law that has come to be known informally as the Riot Boosting Act: an assault on Americans' right to protest that perversely tries to pass itself off as a good-governance measure. Conceived with the assistance of TC Energy (TransCanada) — the company behind the embattled Keystone XL pipeline — this law would, among other things, authorize the state to sue individuals and groups for protesting projects like Keystone XL, should there be any damages as a result of the protest.

The insidious nature of this law becomes obvious on closer inspection. By coining a new term — "riot boosting" — South Dakota creates an atmosphere of vagueness and fear that aims to chill the voices of indigenous people and others who are passionately opposed to projects like Keystone XL. After all, the state already has a law on the books to punish those who might destroy property or put people in danger during a protest.

But the Riot Boosting Act is different. It creates a fund specifically dedicated to going after individuals, groups, and organizations outside of the state that it believes are "riot boosting." Could someone leading 500 people in a chant at a pipeline protest where five people end up getting in an altercation with police be considered to have "encouraged" a riot? Could someone sharing details of a protest — time, place, what to wear, etc. — on his or her Facebook page be seen as "advising" rioters? Those are exactly the sorts of questions that South Dakota and TransCanada want pipeline opponents to be asking themselves. Their hope is that fear of legal repercussions, no matter how tenuous, will keep these people silent, at home, not watching as projects like Keystone XL further degrade our environment and threaten the health and heritage of entire communities.

If you think that sounds like a law designed to have a chilling effect on free speech, the American Civil Liberties Union (ACLU) agrees. Representing Dakota Rural Action and several other groups, the ACLU has filed suit against the state, asserting that the Riot Boosting Act and a pair of other closely related laws violate the First and Fourteenth Amendments to the Constitution.

Sadly, the drama unfolding in South Dakota is a single example of a nationwide anti–free speech push from the fossil fuel industry. At the time of writing, legislators in Illinois, Idaho, Indiana, Kentucky, Minnesota, Missouri, Ohio, Tennessee, and Texas are considering bills that create or intensify penalties for protests near oil and gas pipelines. (This regularly updated tracker provides a running list of state and federal laws geared toward restricting the people's right to protest.)

Indeed, the laws being pushed in Texas and passed in Louisiana are often flagged as the worst of the bunch. In Texas, House Bill 3557 would make some forms of protest a second-degree felony, on par with second-degree murder. It also contains the same long-arm provisions as the South Dakota bill, authorizing the state to go after organizations seen to have supported protesters with penalties of up to $1 million. In Louisiana, a clever reclassification of oil pipelines as "critical infrastructure" now means that protesters assembled too close to pipelines can be prosecuted for criminal trespassing, a felony offense for which a conviction may bring prison time.

Many of these laws may be found unconstitutional. But while their constitutionality can be debated, one thing is beyond debate: They are deeply, profoundly un-American. The First Amendment right to peaceful assembly isn't some bit of arcane legal wording that can be relaxed whenever it proves troublesome to corporate interests or their friends in high governmental places. It's a bedrock principle of American freedom. And if it's somehow decided that we don't have the right, after all, to protest things that we believe pose a threat to our health, our communities, or our future, then we'll have entered a new phase of American history that would make our nation's founders shudder with fear.