Some celebrities got political the moment they stepped on the red carpet Sunday, with blue ribbons pinned onto their gowns and tuxedos at the Academy Awards.

Social media users were quick to start asking questions about what the ribbons signified, as stars including Lin Manuel Miranda, of "Hamilton" fame, actress Ruth Negga of the nominated film "Loving," and Barry Jenkins, the director of “Moonlight," hit the red carpet with the ribbons.

What's That Blue Ribbon Stars Are Wearing on Oscar Red Carpet? https://t.co/X0gDm6B3Z4 pic.twitter.com/g0NCdlUZf5 — TheWrap (@TheWrap) February 26, 2017

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According to reports, the ribbons are blue American Civil Liberties Union (ACLU) symbols expressing support for the organization and its work.

The ACLU has been a major opponent of President Trump's policies, such as his executive order temporarily banning citizens from seven Muslim-majority countries from entering the U.S. and his rollback of public school protections for transgender students.

The ACLU filed a lawsuit against the Trump administration in January on behalf of two men detained at New York’s John F. Kennedy International Airport and threatened with deportation following the executive order.

The ACLU gained more than 150,000 new members after the lawsuit, and a judge issued an emergency stay on the order.