Onyx applies for work with Precision Design Company, which requires union membership as a condition of employment. She also applies for work with Quality Engineering, Inc., which does not require...

Onyx applies for work with Precision Design Company, which requires union membership as a condition of employment. She also applies for work with Quality Engineering, Inc., which does not require union membership as a condition of employment but requires employees to join a union after six months on the job. Are these conditions legal? Why or why not? (See Labor Unions.)