It is not "legal" or "lawful" for anyone to convert your property. Based on your question, it sounds like your brother-in-law may be converting...

Can my employer suspend me for sexual harassment when the supposed victim never claimed such?

I do not believe you have a Title VII claim under the facts provided unless you specifically and clearly opposed a form of unlawful discrimination...

Can my employer take away my coast of living raise?

Are you under contract with your employer? Are you a federal employee?

When is it possible to force an employer to install security cameras? Would legal action help?

Unfortunately, you can not compel your employer to install monitoring equipment. The law does not require an employer to protect you or your...