Hugh Hewitt has covered this many times on his show. He used to be an attorney in the Office of Personnel Management. He had walked thru chapter and verse on how, at the end of the day, it is virtually impossible to fire a Federal employee.
It took three years to convict the guy of what was a clear cut case, and it wasn't until years later when all the appeals were finished (and denied), that the teacher could be fired.
Unions, such a fine invention for criminals.........
Oops. Forgot to say the guy was collecting his salary and benefits the whole time the trial and appeals were going on.