In addition , he was associated with Hammerskin Nation , according to Mark Potok , director of the center . NEW : Page was associated with `` the scariest , most violent skinhead group , '' the director of the SPLC says . The FBI has been investigating a number of hate groups since last year and is looking into whether there are any ties to New York City Mayor Michael Bloomberg. There are more than 1,000 hate groups active in the United States , a rights group says . Some recruit through music .
NEW : Page was associated with `` the scariest , most violent skinhead group , '' the director of the SPLC says . The FBI has been investigating a number of hate groups since last year and is looking into whether there are any ties to New York City Mayor Michael Bloomberg. There are more than 1,000 hate groups active in the United States , a rights group says . Some recruit through music .