Unfortunately, there is probably nothing that can be done short of your husband's employer voluntarily reinstating his security escort. The fact is that in an "at will" employent arrangement, an employer can set the terms and conditions of the workplace much as it sees fit or deems necessary. This includes what type of security to have in order to protect its employee's.Accordingly, unless this action is prohibited by company policy, a union agreement or can employment contract, your husband as no right to such an escort. Also his treatment must not be based n some form of actionable discrimination or retaliation.