The memorial is being held Sunday at Evergreen Cemetery in Oakland. Community leaders and families are holding a prayer vigil and celebration for those who perished.
It was November 18th, 1978 when San Mateo Congressman Leo Ryan and his legal aide, Jackie Speier, went to investigate the People's Temple Cult involving many Bay Area people under cult leader Jim Jones.
It turned violent -- Congressman Ryan was shot and killed. Speier and others were left for dead.
Then cult members were given cyanide-laced Kool-Aid. 900 men, women and children died.
Speier survived and went on to serve San Mateo in Congress.