A Brooklyn boy was spit on by a passing bicyclist in a suspected anti-Jewish hate crime — outraging his activist grandmother, who still mourns the son she lost in a 1994 anti-Semitic terror attack on the Brooklyn Bridge.

The 13-year-old victim went home and told his mother after he was spit on near Eastern Parkway and Albany Ave. in Crown Heights about 5:50 p.m. Wednesday.

His mother called her mother, Devorah Halberstam, who was thrust into a life of activism after her son was shot to death while riding in a van full of fellow yeshiva students three decades ago.

The NYPD was notified about the spitting incident and Hate Crime Task Force investigators are looking for the suspect, described as a light-skinned Black man in his 30s.

Clad in a rainbow-colored jacket, he sped by on his bike

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