"There was more white people actually out there than black people," said organizer Tiana Day. "There was more of every color out there than actually black people and it was crazy to see how many people were in support of it."
[Ads /]
But beyond protests and posts on social media. What does it really mean to be an ally?
"Allyship requires a common cause and a common fate," says Florida A&M University Assistant Professor Dr. Kimberly Brown Pellum. She points to one of the United States earliest examples; John Brown, a white abolitionist who was hanged after an effort to start an armed slave revolt and destroy the institution of slavery.
"It really underscores what sacrifice looks like," Dr. Brown Pellum says.
ABC7 LISTENS: 'Allies in Action: A Bay Area Conversation'
'Allies in Action: A Bay Area Conversation'
From co-founding the NAACP to fighting in the civil rights movement, white people have been allies throughout American history. But Dr. Brown Pellum argues, it hasn't gone far enough.
"If a group of persons are responsible for having built a system of oppression, those persons should also be responsible for dismantling that system," Brown Pellum says.
[Ads /]
That's where Carla Wallace comes in. She founded Showing Up for Racial Justice, or SURJ, a national network of groups and individuals organizing white people for racial justice.
"Those of us who are white when we say, 'What can we do? What can we do?' The work that we actually have to do is move other white people."
She describes the challenges and roadblocks.
"I think some white people get stuck in the idea that if we just develop a good heart, good intentions and good thoughts, that's enough," Wallace says. "And while that is critical part of the journey is our own journey of change. If we are not pushing against structural and institutional racism, then we're just better hearted people and things really will not change for people of color in this community."
VIDEO: What are structural, institutional and systemic racism?
How to explain structural, institutional, systemic racism
East Oakland activist John Jones, III gives people this advice.
"Start with organizing in your own community, in your own neighborhood," Jones says. "Organize your family members, your coworkers, use your privilege, because they have a level of assets that we as black people, people color do not have."
[Ads /]
Tamika Butler trains people and organizations on how to be allies, and says the key component is action.
RELATED: Meet the 2 Bay Area teens who organized, led massive Black Lives Matter rally on Golden Gate Bridge
"We all have to figure out what we're going to do," Butler says. "What we're going to incorporate in our lives, what we're deeply going to change. And in particular, we need again, people who have not been part of oppressed groups. We need people who are white, who have historically held power. And so what folks who really want to see the systematic change have to realize is that these individuals have a role to play and they can do something."
Taking action, and defining what allyship means for you.
See more stories related to race in America here.
See more stories and videos about Building a Better Bay Area here.