"Our hope was that as the memory of 9/11 goes down, things would get better. But they have not," said Rajwant Singh, a dentist from suburban Washington and one of the campaign's volunteer organizers.
US Sikhs launch ad campaign that looks to push back on hate →
"Our concern is, how do we tackle these hate groups operating underground or in darkness?" he said.
Wis. temple shooter's motives might never be known →