Anyone know of an employment attorney that will work on a contingency basis?

I called in sick 1 day and so did a white co-worker. Upon returning to work, I presented my manager with a doctor's note. My manager was not pleased that I missed the day and threatened "written corrective action" if it happened again. The white co-worker that missed the same day presented papers to management proving that she had been in jail. After this incident, I questioned via email, why management felt that it was ok for her to miss work because she was in jail and why I was given such a hard time when I was ill and even presented a doctors note. In the email, I did express that I felt they were showing favoritism and unfairness.I also questioned why the 3 black people had to be at work at 8AM but everyone else was given the opportunity to adjust their work schedule. I actually have video footage showing that at 8AM. The only people in the office were the 3 black people that HAD to be there at 8AM. Prior to me sending said email, my manager emailed me stating that ALL positions will remain viable in the future because locks were up and we were going to be busy soon. About 3 weeks later, I was "layed off".