The BLM constitution requires all new members to be Labour Party members. New members who join BLM must be members of the Labour Party. Black Labour members who have been suspended from Labour, but not expelled, will remain members of BLM.

BLM members who believe they have been expelled from the Labour Party unfairly, along with all individuals about whom membership decisions are taken, have the right to a hearing by BLM National Steering Group.

Friends of BLM/Associate members can participate in campaigns and activities organised by a local group, network or BLM nationally, but cannot hold a position within BLM, vote in elections or hold other membership rights.