The Avengers Assemble to Support Dakota Access Pipeline Protesters

The Avengers stars are on a mission to get President Barack Obama‘s attention in support of protestors aiming to halt the Dakota Access Pipeline.

Protestors say the 1,172-mile conduit that is planned to cross the Missouri River would put their community’s sole water source at risk and destroy sacred Native American sites.

Among those joining the protesters in solidarity are actors Mark Ruffalo, Samuel L. Jackson, Chris Hemsworth and Chris Evans. In the past few weeks, all four Avengers stars took to social media to share their support — and encourage President Obama to join forces with them.

“Take a stand for our brothers and sisters in #StandingRock! Join me in telling @barackobama to just say #NoDAPL. Period. Sign the petition and #StandWithStandingRock at the link in my bio,” Ruffalo, also known as the Hulk in the Marvel films, said in a video bringing attention to the cause.

Soon after, Jackson shared a video with the same message, and captioned his post, “I’m saying #nodapl and @barackobama should too! Sign the petition and standwithstandingrock.net #standwithstandingrock.”

Last week, Chris Hemsworth shared a message about how he was “stupidly unaware” when he decided to wear a “traditional dress of First Nations people” to a New Year’s Eve party. In the first post, the Thor actor wore his superhero costume and held a sign that said, “We stand with Standing Rock #WaterisLife #NoDAPL #MniWiconi.” And on Friday night, the actor posted another Instagram post, encouraging his followers to sign the petition.

Chris Evans took to Twitter to lend his support to the cause, sharing a tweet with a link to the Standing with Standing Rock website. “Tell @POTUS to say #NoDAPL by signing the standingwithstandingrock.net petition!!” the star, who played Captain America, wrote.

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Other celebrities, including Leonardo DiCaprio, Shailene Woodley and Susan Sarandon, have joined in to support the months-long protests against the multi-billion dollar oil pipeline project. The protests came to a head last Thursday as police officers in riot gear faced off with protestors.

At least 141 people were arrested, many of whom were members of the Standing Rock nation and other tribes who are opposed to the construction of the pipeline.