An illegal strike is a work stoppage or strike action that violates the law. Most public-sector strikes are illegal, along with those that violate an existing labor contract, are not properly authorized by union membership, or contravene a court order.
An unauthorized strike, also known as a wildcat strike, occurs when employees cease work without the authorization of their union or outside the terms of the collective bargaining agreement. These types of strikes are typically spontaneous and are not sanctioned by the union leadership.
