More than 100 high-profile celebrities have joined a MoveOn.org campaign called “United Against Hate” in an all-out effort to stop Donald Trump from winning the White House in November.

Celebrities who have joined the offensive against Trump include director Paul Haggis, television showrunner Shonda Rhimes, actors Mark Ruffalo, Bryan Cranston and Woody Harrelson and actresses Kerry Washington, Olivia Wilde, Julianne Moore, Lena Dunham and Jane Fonda.

In a letter shared exclusively with Mic, the star-studded group said it intends to “use the power of our voice and the power of our vote to defeat Donald Trump and the hateful ideology he represents.”

“When dangerous and divisive leaders have come to power in the past, it has been in part because those of goodwill failed to speak out for themselves or their fellow citizens,” the letter continues. “Some of us come from the groups Trump has attacked. Some of us don’t. But as history has shown, it’s often only a matter of time before the ‘other’ becomes me.”

MoveOn took to Twitter Tuesday to promote its latest initiative.

A few months ago, we launched a campaign to stop Donald Trump and his hate from reaching the White House. #UnitedAgainstHate — MoveOn (@MoveOn) July 26, 2016

https://twitter.com/MoveOn/status/757955743152742400

Actor Samuel L. Jackson also joined the group’s anti-Trump effort:

https://twitter.com/MoveOn/status/757999937015525376

The group also consists of several musicians who have previously railed against Trump.

The band Third Eye Blind, who recently used an RNC charity event to bash conservatives; rapper Macklemore, who added his talent to the recently released anti-Trump anthem “F*ck Donald Trump;” and Twitter bully and rapper Talib Kweli are among the signatories to the letter.

YouTube star Laci Green, who also joined the campaign against Trump, told Mic that the GOP presidential nominee appeals to the “darkest tendencies of Americans.”