George Floyd’s younger brother took his grief to the US Congress on Wednesday with an impassioned plea that lawmakers do not let his brother’s death be in vain, lamenting that he “didn’t deserve to die over $20” in a what he called a lynching.

The House of Representatives Judiciary Committee held the first congressional hearing to examine racial injustice and police brutality following George Floyd’s May 25 death after a Minneapolis policeman knelt on his neck for nearly nine minutes. His death prompted a wave of protests in US cities and abroad...