A woman must decide whether to stand by her husband after she discovers he was part of a gang that carried out a vicious, racist attack 22 years earlier. She is black. He is white.

Perhaps try and start with the discovery first then bring in the decision and definitely as Sharkeatingman suggested describe her more accurately.

Only thing is the MC could use more of a force to struggle with to add weight to the moral dilemma. Perhaps their child is the victim of a recent attack or someone close to her was killed by the husbands gang years before etc…
Because the logline seams to lack a clear AN and needs a more significant struggle that said sounds interesting would love to see such a story.

After discovering her husband was responsible for a racist attack years before a black (enter job title or other character description) must decide whether to stand by him or not in light of history repeating itself on their child.

Hope this helps Nir.