Activist artists say they transformed a plot of land near President Donald Trump's Bedminster golf course into a satirical cemetery Friday night, on the eve of the one-year anniversary of his inauguration.

The West Coast-based art collective INDECLINE, which anonymously creates and installs sociologically and politically focused pieces, shared a video of the purported work -- called "Grave New World" -- on its website Saturday.

Members of the group constructed a cemetery entryway and tombstones, commemorating certain liberties or laws that Trump "essentially killed during his first year in office," an anonymous spokesperson said Sunday. Five members of the collective installed the piece overnight so it would be ready for the anniversary Saturday morning.

"The dates on the tombstone correspond with some of these actions throughout the first year," the spokesperson said.

One tombstone, "Decency," corresponds with the date of Trump's inauguration, while another "Our Future" matches the date the president ordered an end to DACA, the program that protects young undocumented immigrants from deportation.

The collection's spokesperson said the group had been prepping for a piece that would act as a "political report card," for Trump's first year in office, noting that many other artists were doing the same.

The idea to construct their commentary on the New Jersey plot came from a Washington Post article that reported Trump had decided to make the land his family's designated resting place.

"We were just helping him break ground," the spokesperson said.

Bedminster Mayor Steven Parker said Sunday that police were aware of the installation and had alerted the Secret Service, but were not taking the display as a threat.

"I don't believe it to be anything serious," Parker told NJ Advance Media. "I think people are looking at it as a prank -- a very elaborate one at that."

Parker said a few residents around the township have been making their views of the president known over the last year or so, but nothing that the police force or security teams have to worry about. They're simply expressing their views, he said.

In September, the New Jersey course was vandalized with slogans critical of Trump's administration, along with three of the president's other clubs.

An inquiry with township police on whether the installation remained intact Sunday was not returned, and the spokesperson for INDECLINE wasn't sure of its status either.

"If you look at our work, you can tell we can leave behind a wake of disruption if we want to," the spokesperson said. "But this was intelligently planned, we just like to engage people."

Paige Gross may be reached at pgross@njadvancemedia.com. Follow her on Twitter @By_paigegross. Find NJ.com on Facebook.