. >> reporter: darren lamont jenkins, leader of the one people's project. >> we are here today becauseumber of white supremacists decided to hold this massive rally, the third one that they've had in i guess as many months. it's supposed to be one of the larger ones. >> reporter: jenkins' organization monitors and publishes information about alleged racist and supremacist groups. >> is this guy wearing a hitler -- yes, he is. i'm just going to take a picture of him. >> why do you videotape them? >> because people need to know who they are. >> reporter: his group has joined with many others to counter the white supremacist message. female like matt heimbach see it differently. >> we're doing the lord's work. what is there to be nervous about doing the lord's work? >> reporter: "nightline" co-anchor byron pitts first met heimbach three years ago. he's a young man who back then had been called the future of the white supremacist movement by someone who ought to know. a former grand wizard of the kkk. >> do you see a young david duke in matt heimbach? >> if you combine honesty, sincerity w