Less directly related to BLM’s root cause, but another good resource. Demand Progress is a fiscally-sponsored project of Sixteen Thirty Fund, a 501(c)4 social welfare organization. Demand Progress seeks to protect the democratic character of the internet — and wield it to make government accountable and contest concentrated corporate power.
They work to win progressive policy changes for ordinary people through organizing and grassroots lobbying. They focus on issues of civil liberties, civil rights, and government reform. I stay subscribed via email for constant updates on ongoing issues and active campaigns.