Ok well from what I have found and know:
There are several similarities in the case of Emmett Till and Tom Robinson. Emmett Till's case is heartbreaking. He was just 14 when he was tortured and killed in Mississippi in the 1950s. Emmett lived with his mother in Chicago and had heard stories of Mississippi. When an uncle came to visit, Emmett told him he wanted to go and visit. This starts the tragic chain of events.
Emmett Till was a black male accused of flirting with a white woman, while Tom Robinson was a black male accused of raping a white woman.
The trials are very similar. The jury was made up of all white men and did not take long to come back with a verdict.
The courtroom was segregated.
Unlike the case of Tom Robinson, Emmett Till was never put on trial in a courtroom; his young body was discovered in the river. Just like in To Kill a Mockingbird, the men who did commit a crime were white, and they all got away with their crimes. Roy Bryant and J.W. Milam never thought of themselves as guilty and didn't think that they did anything wrong, just like Bob Ewell. There are striking similarities in the two men, but sadly Emmett Till is not the work of fiction.
Hope this helps.