Human Resources Confidentiality Agreement Does An Employer Have The Right To Fire A Person After She Makes A Complaint About Her Manager?

Does an employer have the right to fire a person after she makes a complaint about her manager? - human resources confidentiality agreement

My friend has just completed her Pharmacy technician job immidiatly Mangager after discussion with human resources (secret) by his manager wrong in how he treats her and others with whom you work. Three other partners, spoke with the director of personnel to tell them that day, but my friend, has closed. My boyfriend is very experienced and he has been unduly hard work and want to know what their rights are. More ... It is their anything we can do to repay in the law? Thank you.