They'll complain.. threaten lawsuits, demand things they don't earn, then sue you. Oh yes they will.
They'll demotivate your good people.
They'll trash you online anonymously.
They'll make you look bad. They'll lose your customers.
They'll steal.
They'll use their pay to degrade society by financially contributing to abhorrent causes and people through their purchases.
MAKE. THE. MOTHERFUCKERS. SUFFER. Eliminate their influence by degrading their lives
The easiest way to identify and get rid of a lot of them is to have a strict late policy. Liberals tend to want to waltz in 20 minutes late to everything.