Verizon fired 40 union members in December for picket-line activity. Aren’t members protected in legally sanctioned strikes?
Not always. The courts and the NLRB have given employers the ability to discipline workers for “picket line misconduct” or “egregious misconduct.”
They define misconduct as assaults, property destruction, and extensive blocking of non-strikers, including strikebreakers.
That's right, strikers cannot legally impede the efforts of strike-breakers.
http://labornotes.org/2011/12/striking-back-against-picket-line-retaliation