The Sikh Coalition group, is representing the victim Balwinder Jit Singh, who worked as a bus driver for 17 years.
While he was being beaten by a passenger on November 6, Singh kept his foot on the brake of his bus to ensure the safety of the pedestrians and passengers.
The assault left Singh in the hospital with a black eye, swollen and bruised face and jaw, and infection in his eye.
Singh, who is on the board of a recently-vandalised Gurdwara in Buena Park, has retained the Sikh Coalition to represent him in this ongoing criminal investigation.
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Although he immediately reported the incident to the police, he delayed going public because he didn't know how to do so until he contacted the Sikh Coalition.
"I know that sharing my story sheds further light on the bigotry and hatred faced by communities across the nation. These crimes cannot be tolerated," he said in a statement issued through Sikh Coalition.
Police say the suspect potentially faces only misdemeanour assault charges for attacking Singh.
"These charges fail to capture the violent nature of the attack, and the anti-Sikh bias that precipitated it," the statement said adding that the Sikh Coalition's legal team is working with the local sheriff's department and the FBI to push for a hate crime investigation and prosecution.
"In the face of hateful rhetoric and the current climate of fear, we must ensure that all bias-based incidents are thoroughly investigated and the perpetrators brought to justice," said the Sikh Coalition's senior staff attorney Gurjot Kaur.