Police are asking for information after they found the woman, believed to be around 20, with life-threatening injuries in Southwark, south London, around 3 a.m.
In a statement on its Facebook page, the Taking The Initiative party said Sasha Johnson had received numerous death threats.
The statement read: “It is with great sadness that we inform you that our own Sasha Johnson was shot in the head.
“Sasha has always been an active advocate for black people and the injustices that surround the black community, in addition to being both a member of the BLM and a member of the executive board of the Taking the Initiative party.
“Sasha is also a mother of three and a strong and powerful voice for our people and our community.
“Let us all come together and pray for Sasha, pray for her recovery, and show our support for her family and loved ones. “
She has reportedly severed ties with the Black Lives Matter movement in recent months.
Detectives from the Met’s Specialist Crime Command (Trident) are investigating.
There is a significant police presence in the area as investigations continue and a number of roads are currently closed.
No arrests were made.
Chief Detective Inspector Jimi Tele said: “We all hope this young woman’s condition improves.
“Our investigation is in its early stages and urgent investigations are underway to establish the circumstances.
“I would appeal to residents of Consort Road and surrounding areas to check any doorbells or dashcam videos for any suspicious activity that may be related to this investigation. “
Anyone with information about the incident is asked to call police on 101 or tweet @MetCC quoting CAD 1172/23 May.
They can also contact Crimestoppers anonymously on 0800 555 111.
Last August, she was one of the organizers of the very first One Million People’s March to protest systemic racism in the UK. During the protest, hundreds of people took to the streets of West London.
She said she hoped the movement would “empower the community to fight for the better.”
“As a people, we are not going to stop until we have the same rights and justice,” she said.
“Our message is to listen to ourselves, to hear our words, we want lasting and tangible change.
“We don’t want token promises, we don’t want it to come from a hegemonic point of view. We want it to be for the people. ”