"PHOTOS: Since Standing Rock, 56 Bills Have Been Introduced in 30 States to Restrict Protests",  16 Feb 2018

... In total, some 800 people were charged with crimes during the 11 months between the establishment of the first protest camp, known as Sacred Stone, and the eviction of Oceti Sakowin. While several hundred cases have been thrown out for lack of evidence, more than 200 people are still awaiting trial, according to the Water Protecter Legal Collective. Several face felony charges and years in prison. Williams was not the only journalist arrested...Greenpeace and other environmental groups supportive of the Standing Rock Sioux are themselves facing a lawsuit from Energy Transfer Partners, which alleges that the organization engaged in racketeering.

... For months, according to...The Intercept, local and federal law enforcement worked alongside a private security firm called TigerSwan... to collect information about Standing Rock participants and supportive groups.

...An hour after police evicted the last demonstrators from Oceti Sakowin, North Dakota Governor Doug Burgum signed four measures increasing punishments for demonstrators.. [A]ccording to the International Center for Not-for-Profit Law, lawmakers in 30 states have introduced 56 bills to restrict public protest since Trump’s election...Though only a few of the bills introduced last year became law, several others are pending. 

...In late October, 80 Republicans and four Democrats sent a letter to Attorney General Jeff Sessions asking whether demonstrators who target energy infrastructure might be prosecuted as domestic terrorism...The Trump administration’s aggressive promotion of expanded fossil-fuel production means that clashes over infrastructure are likely to spread, and become more fraught with questions about the rights of protesters. 

[Also refers to TigerSwan]