"We need them to investigate the entire injustice system in Waller County because we believe our dear sister Sandra Bland did not have a chance," said Deric Muhammad, an activist.
Friday's event came a day after Texas State Trooper Brian Encinia turned himself in. He was indicted on perjury charges for allegedly lying about Bland's arrest during a traffic stop.
Bland died in her jail cell three days after the traffic stop. Her death was ruled a suicide.
Bland family: Justice has not yet been served