The caller apparently called the actor a gay slur and in an aggressive manner warned Topher Grace that his role in BlacKkKlansman was going to ruin race relations in America.
According to TMZ, police have gotten involved after Topher Grace received a troubling phone call from someone denouncing his role as David Duke.
The authorities took an incident report, with TMZ saying that depending on if the caller threatened the actor and how, this could lead to a hate crime investigation.
Topher Grace contacted police after the threatening phone call.