Some 150 people attended the launch of the Ferguson Solidarity tour in Brixton, south London, last Saturday.
And more than 100 people attended an angry meeting in Tottenham, north London, the next day.
The tour has been organised by Defend the Right to Protest, the NUS black students’ campaign and United Families and Friends.
Speakers discussed the fight to get justice for black people killed by police in both Britain and the US.
Black Lives Matter organiser Patrisse Cullors told the Tottenham meeting how the movement is growing in the US.
Mark Duggan’s aunt Carole also spoke. His killing by police in Tottenham sparked the 2011 riots.
Patrisse also addressed the Brixton meeting via video link. She said the Missouri governor’s declaration of a state of emergency after Michael Brown’s killing was a “declaration of war on black people”.
Family campaigners including Marcia Rigg also spoke.
Labour MP Chuka Umunna talked about his family’s experience of police harassment—but claimed things were getting better.
But Lorna Campbell from the London Campaign against Police and State Violence said police “anti-gang” tactics would “devastate black communities.”