It comes after campaigners from organisations including Extinction Rebellion, the Afrikan Emancipation Day Reparations March Committee and Rhodes Must Fall Oxford blocked the A23 Brixton Road.
But police imposed a curfew on the demonstrations to stop people halting traffic or joining raves in Brixton.
The event marked the passing 1833 Abolition of Slavery Act, which came into force on 1 August 1834.
Campaigners argue that the millions of pounds in compensation paid to former slaveholders as a result of the Act - without similar recompense for freed slaves - has increased racial injustice.
TODOS OS ARGUMENTOS SÃO VÁLIDOS E AI DE QUEM OS COMBATA QUE É LOGO RACISTA.
E AGORA QUE INAUGURARAM O CAMINHO MARÍTIMO DA FRANÇA PARA A LAWLESS LONDON DO AMIGO PAQUISTANÊS NUMA DE "DESCOBRIMENTOS " DOS BONS UI UI UI