The phrase "activists signed" is correct and usable in written English.
It can be used when referring to a group of activists who have endorsed or agreed to a statement, petition, or document.
Example: "In support of climate action, activists signed a petition urging the government to take immediate measures."
Alternatives: "activists endorsed" or "activists agreed to".
More than 300 intellectuals and activists signed the charter, which was drafted in part by Mr. Liu.
Seventy-four Cuban opposition activists signed a letter Thursday supporting a bill in the United States Congress that would lift the American ban on travel to Cuba and increase American food exports to the island.
NBC said that the activists signed the affidavit, saying, in effect, that they had seen what happened and were empowered by a rarely used Ohio law to accuse the officers of aggravated murder.
Dozens of high-profile conservative leaders and activists signed an open letter published Tuesday that denounced the bipartisan bill, saying the Senate "would do better to start over from scratch".
But an all-too-brief "Damascus spring" did not last long.At the beginning of 2001 more than 1,000 Syrian activists signed a declaration calling for political reform and an end to the state of emergency that has been in effect since 1963, ostensibly because of the conflict with Israel.
The fair was whipped into shape by Roland Algrant of the International Freedom to Publish Committee at the Association of American Publishers, and an oddball collection of heads of houses, acquisitions editors, sales managers, and human-rights activists signed up for the trip.
More than 500 young Labour members, youth councillors and activists have signed a letter calling on Corbyn to step down, organised by the former Corbynite activist Siddo Dwyer, 19.
Xiaobo was one of more than three hundred scholars, writers, and activists who signed the Charter.
Many intellectuals and activists who signed the petition subsequently were arrested and detained, but their efforts continued throughout the following decade.
J. M. Coetzee, Toni Morrison, Junot Díaz, and several other writers and activists have signed a petition to make books a part of post-disaster relief efforts.
Hundreds of Chinese activists have signed a striking public appeal for democratic reforms, but police detained two of the signatories before it was even issued today.
