The #BlackLivesMatter movement started in 2012 as a result of 17-year-old Trayvon Martin's death. Since then, the movement has worked tirelessly to expose police brutality, racial profiling, and racial inequality experienced by African Americans.

#BlackLivesMatter has some vocal opponents, however. Folks in the #AllLivesMatter movement have criticized the aforementioned group for directing their attention to injustices done to only African Americans. But many believe that the #AllLivesMatter movement is rooted in racism. For example, U.S. representative Keith Ellison said that “When you say ‘all lives matter’ you are ignoring centuries of institutionalized American racism."
 And this past November, individuals beat up a Black Lives Matter protester in Alabama during a Donald Trump rally. In this video, you can hear one of the Trump supporters scream "all lives matter.”

Sources: Gizmodo