Federal authorities have rolled out strict new rules to stop masked agitators in Portland and other cities from hiding their identities during violent protests. The Department of Homeland Security announced that its updated security measures are now in full effect, months ahead of schedule.

The policy bans anyone from wearing masks, disguises, or costumes to conceal their identity while breaking the law on or near federal property. The rule also targets harassment, disorderly conduct, and physical attacks against law enforcement officers — behavior that has long defined Portland’s nightly protests.

“All persons are prohibited from engaging in the following conduct, on federal property or in areas outside federal property, that affects, threatens, or endangers federal property or persons on the federal property,” the DHS statement reads.

Among the banned acts are “assaulting, fighting, harassing, intimidating, threatening or other violent behavior, lewd acts, or the inappropriate disposal of feces, urine, and other bodily fluids.”

Another key section makes clear that it is now illegal to disguise one’s identity when committing crimes near federal property.

“Wearing a mask, hood, disguise, or device that conceals the identity of the wearer when attempting to avoid detection or identification while violating any federal, state, or local law, ordinance, or regulation,” the rule states.

The move comes after months of escalating violence outside Portland’s federal immigration facility, where activists dressed in full costumes to distract officers and confuse surveillance systems. Some of these same groups also appeared during the “No Kings” protests in mid-October, where they vandalized property and taunted federal agents.

DHS says the new rules went into effect earlier than planned because of the rise in attacks against federal immigration officers and detention centers.

Katie Daviscourt, an investigative reporter with The Post Millennial who spoke at President Donald Trump’s Antifa roundtable last month, called the DHS policy a “game changer.”

She said the new rules finally give law enforcement “the power and clarity they need to stop these groups before violence spreads.”

The DHS outlined several other critical updates to its regulations. The policy expands federal officers’ authority to bring charges for crimes that happen off federal property if they affect security on federal grounds. It also addresses drone use, digital tampering, and other security threats that have been used to disrupt enforcement.

According to DHS, the goal is to “enhance collaboration between federal tenants, security personnel, and local law enforcement” while ensuring “clearer public notice” at all federal facilities.

The rule also bans the creation of “loud or unusual noise, noxious odor, or other nuisance,” which federal officers say has been a tactic used by left-wing agitators to overwhelm and distract law enforcement during standoffs.

Under the new policy, federal agents can now move faster to arrest offenders, file charges, and coordinate with local police without bureaucratic delay.

DHS officials say this measure will help restore order in areas where violence and vandalism have become routine. The policy was accelerated specifically to give agents more tools to stop criminal activity tied to radical groups targeting federal buildings.

For years, Portland has been the epicenter of unrest, with protesters regularly confronting law enforcement outside the city’s ICE facility. These groups often use masks, drones, and loud disturbances to prevent officers from identifying them or documenting crimes.

Now, with the new DHS rules in place, those tactics will carry serious consequences. Officials say violators could face federal charges for using disguises or technology to disrupt operations on government property.

The department says the updated regulations are meant to safeguard “the safety, security, and orderly government functions” across all federal locations.

While legal challenges from activist groups are expected, federal officers are already enforcing the new standards — and for the first time in years, they say the tide may be turning against those who once thought they could hide behind a mask.