Iron out union, legal issues

Q. We have an apparent conflict between our union agreement and our responsibility to maintain a harassment-free workplace. The agreement says we must give the shop steward 48 hours' notice before dismissing a regular employee. But we have proof positive that two employees have been harassing—and continue to harass—African-American and gay employees. The two harassers have just caused us to lose a good employee who couldn't take it any longer. What trumps what? —J.V., Louisiana