Union contracts specificy whether or not joining in mandatory. Referred to as a "closed shop," these contracts require that the employers agree to hire only union members (or those that BECOME union members). I think almost every union contract requires all employees to be members.
It's necessary.
that is not nessasary
NO IT IS NOT
that is not nessasary
that is not nessasary
no
just using water for something not nessasary
iodine
Violence should only be used on a teddy bear
a nessasary proper cause
When nessasary to aviod a collision
Methylene blue is necessary for one thing. It is what helps transports cells.