At D.C. march, families decry ‘two systems of justice’

Priscilla Duerrero from Boston, currently living in Washington, D.C., attends the March on Washington, Friday, Aug. 28, 2020, at the Lincoln Memorial in Washington, on the 57th anniversary of the Rev. Martin Luther King Jr.’s “I Have A Dream” speech. (AP Photo/Julio Cortez)

Jacob Blake Sr., father of Jacob Blake, raises his fist in the air while speaking at the March on Washington, Friday Aug. 28, 2020, at the Lincoln Memorial in Washington. (AP Photo/Jacquelyn Martin, Pool)

People walk on Pennsylvania Avenue during the March on Washington, Friday Aug. 28, 2020, on the 57th anniversary of the Rev. Martin Luther King Jr.’s “I Have A Dream” speech. (AP Photo/Jose Luis Magana)

WASHINGTON — Standing on the steps of the Lincoln Memorial, where the Rev. Martin Luther King Jr. famously laid out a vision for harmony between white and Black people 57 years ago, his son issued a sobering reminder about the persistence of police brutality and racist violence targeting Black Americans.