This movie is about as subtle as a sledgehammer, with no shortage of cringeworthy moments and an uninteresting lead performance.

Jordan Hoffman

The Guardian

It’s an eyebrow-raising true tale, one aided and abetted onscreen by the solid cast and strong sense of commitment. But Heckler is caught somewhere between being a journalistic historian and a dramatist without seeming expert at either. His screenplay connects all the dots of the story with no sense of shaping or modulation.

Todd McCarthy

The Hollywood Reporter

As Burden, Garrett Hedlund astonishes in a nuanced portrait of a man resistant to change, until he finally comes to understand that hatred is literally killing him.