The suspect in the deadly shooting attack on two Jewish targets in Kansas yesterday was identified as a prominent white supremacist.

The Southern Poverty Law Center, a hate group monitor, identified the alleged gunman as Frazier Glenn Miller, 73, of Aurora, Mo. The group said he was the “grand dragon” of the Carolina Knights of the Ku Klux Klan in the 1980s and also a founder of the White Patriot Party.

The center said in a statement Sunday that Miller served three years in prison on weapons charges and for plotting the assassination of its founder, Morris Dees.

CBS News also identified the suspect as Miller, and a security source confirmed to JTA that the suspect had a long history in the supremacist movement.

Miller is suspected of killing a grandfather and his grandson on Sunday at the Jewish Community Center in Overland Park, Kan., and then shooting to death a female resident of Village Shalom, a Jewish assisted-living facility a few blocks away.

The family of the victims killed at the JCC identified them as William Lewis Corporon and his 14-year-old grandson, Reat Griffin Underwood, ABC news reported. KSHB, a local TV station, said they were members of the Church of Resurrection.

The JCC was hosting a dance class and an audition for a play, both for teenagers, according to reports.

President Obama said in a statement that he “pledged the full support of the federal government” in the investigation.

Meanwhile, Jewish groups have already reached out, expressing condolences and calling for heightened awareness in the campaign to fight anti-Semitism and hate crimes.

“The attacks on the Jewish community centers in Overland Park are a cowardly, unspeakable and heinous act of violence,” said Karen Aroesty, ADL St. Louis Regional Director.

“While it is too early to label these shootings as a hate crime, the fact that two Jewish institutions were targeted by the same individual just prior to the start of the Passover holiday is deeply troubling and certainly gives us pause. We have reached out to local, state and federal law enforcement and stand willing and able to offer guidance and assistance to the community if this incident turns out to have been motivated by anti-Semitism.”