The phrase "activist at a" is correct and usable in written English.
It can be used when referring to someone who is an activist associated with a specific organization or cause.
Example: "She is an activist at a local environmental organization, advocating for sustainable practices."
Alternatives: "activist with a" or "activist for a".
'Her death serves me more than it served her,' said one activist at a Hamas funeral yesterday.
"I was living as a volunteer activist at a community housing project in Notting Hill when the film came out.
"It is a positive thing and pushes forward our revolution's goals," said Salah al-Nagb, a youth activist at a sit-in in Sana.
"Silence has killed us," read the reproachful sign held by an Islamist activist at a recent rally in Cairo that was busted by tear gas and police gunfire.
The Queensland senator-elect Pauline Hanson has been publicly derided as a "racist redneck" by an outspoken Aboriginal activist at a Cairns Indigenous art fair.
Who's tomorrow?" was the comment of one civil-rights activist at a meeting held in Cairo to protest at Mr Ibrahim's arrest.The hounding of Mr Ibrahim adds to the ring of state controls shackling Egypt's political development.
A first-generation Venezuelan-American born in New York City, Mr. Camejo became an activist at an early age, speaking out against the Vietnam War and for the rights of migrant workers.
"I kept on and on about it, and he said no, and then I sort of said, 'Well, then, I don't think we can have a future, because I really want a baby.' And he said, 'All right, then.' " One night, Jacqui and Bob went out for a meal with Denise Bennett, a fellow-activist, at a Chinese vegan restaurant in North London.
Gay-rights activists at a rally in St .Petersburg, Russia.
Mr Biden was sighted on Saturday glad-handing Democrat activists at a barbecue jamboree in Delaware.
The line drew hearty applause from the audience of community activists at a church here.
