See also: General strike
Strike action, often simply called a strike, is a work stoppage caused by the mass refusal by employees to perform work. A strike usually takes place in response to employee grievances. Strikes became important during the industrial revolution, when mass labour became important in factories and mines. In most countries, they were quickly made illegal, as factory owners had far more political power than workers. Most western countries partially legalized striking in the late 19th or early 20th centuries.
Strikes are sometimes used to put pressure on governments to change policies. Occasionally, strikes destabilise the rule of a particular political party. A notable example is the Gdańsk Shipyard strike led by Lech Wałęsa. This strike was significant in the struggle for political change in Poland, and was an important mobilised effort that contributed to the fall of governments in communist East Europe.
The strike tactic has a very long history. Towards the end of the 20th dynasty, under Pharaoh Ramses III in ancient Egypt in the 12th century BC, the workers of the royal necropolis organized the first known strike or workers' uprising in history. The event was reported in detail on a papyrus at the time, which has been preserved, and is currently located in Turin. In the modern era, sailors in 1768, in support of demonstrations in London, "struck" or removed the top-gallant sails of merchant ships at port, thus crippling the ships.

Categories of strikes
The Railway Labor Act bans strikes by United States airline and railroad employees except in narrowly defined circumstances. The National Labor Relations Act generally permits strikes, but provides for a mechanism to enjoin strikes in industries in which a strike would create a national emergency. The federal government most recently invoked these statutory provisions to obtain an injunction against a slowdown by the International Longshore and Warehouse Union in 2002.
Some jurisdictions prohibit all strikes by public employees (under such laws as the "Taylor Law" in New York). Other jurisdictions limit strikes only by certain categories of workers, particularly those regarded as critical to society: police and firefighters are among the groups commonly barred from striking in these jurisdictions. Some states, such as Iowa or Florida, do not allow teachers in public schools to strike. Workers have sometimes circumvented these restrictions by falsely claiming inability to work due to illness — this is sometimes called a "sickout" or "blue flu". The term "red flu" has sometimes been used to describe this action when undertaken by firefighters.
It is also illegal for an employee of the United States Federal Government to strike. Prospective federal employees must sign standard form 61, an affidavit not to strike. President Ronald Reagan terminated air traffic controllers after their refusal to return to work from an illegal strike in 1981.
In "Marxist-Leninist" regimes, such as the former USSR or the People's Republic of China, striking is illegal and viewed as counter-revolutionary. Since the government in such systems claims to represent the working class, it has been argued that unions and strikes were not necessary.
Most other totalitarian systems of the left and right also ban strikes. In some democratic countries, such as Mexico, strikes are legal but subject to close regulation by the state (see Mexican labor law).
In 2003, there was a Firefighter dispute in the United Kingdom. The armed forces had to provide temporary cover, using outdated machinery. The strike action was not illegal, although it was condemned by many.

Legal prohibitions on strikes
The term "scab" is a highly derogatory and "fighting word" most frequently used to refer to people who continue to work when trade unionists go on strike action. This is also known as crossing the picket line and often results in their being shunned or assaulted. The classic example from United Kingdom industrial history is that of the miners from Nottinghamshire, who during the 1984-85 miners' strike did not support strike action by fellow mineworkers in other parts of the country. Those who supported the strike claimed that this was because they enjoyed more favourable mining conditions and thus better wages. However, the Nottinghamshire miners argued that they did not participate because the law required a ballot for a national strike and their area vote had seen around 75% vote against a strike.
People hired to replace striking workers are often derogatively termed scabs by those in favour of the strike. The terms strike-breaker, blackleg, and scab labour are also used. Trade unionists also use the epithet "scab" to refer to workers who are willing to accept terms that union workers have rejected and interfere with the strike action. Some say that the word comes from the idea that the "scabs" are covering a wound. However, "scab" was an old-fashioned English insult. An older word is "blackleg" and this is found in the old folk song, Blackleg Miner, which has been sung by many groups.
During "economic" strikes in the U.S., scabs may be hired as permanent replacements.

"Scabs"
The concept of union scabbing refers to any circumstance in which union workers, who normally might be expected to honor picket lines established by fellow working folk during a strike, are inclined or compelled to cross those picket lines or, in some manner, otherwise engage in workplace activity which may prove injurious to the strike.
Unionized workers are sometimes required to cross the picket lines established by other unions due to their organizations having signed contracts which include no-strike clauses. The no-strike clause typically requires that members of the union not conduct any strike action for the duration of the contract. Members who honor the picket line in spite of the strike frequently face discipline, for their action may be viewed as a violation of provisions of the contract. Therefore, any union conducting a strike action typically seeks to include a provision of amnesty for all who honored the picket line in the agreement that settles the strike.
No strike clauses may also prevent unionized workers from engaging in solidarity actions for other workers even when no picket line is crossed. For example, striking workers in manufacturing or mining produce a product which must be transported. In a situation where the factory or mine owners have replaced the strikers, unionized transport workers may feel inclined to refuse to haul any product that is produced by strikebreakers, yet their own contract obligates them to do so.
Historically the practice of union scabbing has been a contentious issue in the union movement, and a point of contention between adherents of different union philosophies. For example, supporters of industrial unions, which have sought to organize entire workplaces without regard to individual skills, have criticized craft unions for organizing workplaces into separate unions according to skill, a circumstance that makes union scabbing more common. Union scabbing is not, however, unique to craft unions.

"Union scabbing"
Most strikes called by unions are somewhat predictable; they typically occur after the contract has expired. However, not all strikes are called by union organizations — some strikes have been called in an effort to pressure employers to recognize unions. Other strikes may be spontaneous actions by working people.
Whatever the cause of the strike, employers are generally motivated to take measures to prevent them, mitigate the impact, or to undermine strikes when they do occur.

Methods used by employers to deal with strikes
Companies which produce products for sale will frequently increase inventories prior to a strike. Salaried employees may be called upon to take the place of strikers, which may entail advance training. If the company has multiple locations, personnel may be redeployed to meet the needs of reduced staff.

Strike preparation
Some companies negotiate with the union during a strike; other companies may see a strike as an opportunity to eliminate the union. This is sometimes accomplished by the importation of replacement workers, or strike breakers. Historically, strike breaking has often coincided with union busting.
Also called Black legging in the early 20th century during the Russian socialist movement. Darkness at Noon by Arthur Koestler p60

Strike breaking
One method of inhibiting a strike is elimination of the union that may launch it, which is sometimes accomplished through union busting. Union busting campaigns may be orchestrated by labor relations consultants, and may utilize the services of agencies that engage in intelligence gathering, or that provide asset protection services. Similar services may be engaged during attempts to defeat organizing drives.

Union busting
Another counter to a strike is a lockout, the form of work stoppage in which an employer refuses to allow employees to work. Two of the three employers involved in the Caravan park grocery workers strike of 2003-2004 locked out their employees in response to a strike against the third member of the employer bargaining group. Lockouts are, with certain exceptions, lawful under United States labor law.

Lockout

Films

Final Offer (film) - A look at the 1984 contract negotiations between General Motors and its union.
Harlan County, USA, Director: Barbara Kopple, USA 1976–A documentary film about a very long and bitter strike of coal miners in Kentucky
American Dream, Director: Barbara Kopple, USA 1990 – A documentary film about the unsuccessful 1985-1986 meatpacker's strike against Hormel Foods in Austin, Minnesota.
Bastard Boys, A miniseries based on the 1998 Australian waterfront dispute. Non-Fiction

Statschka Strike, Director: Sergei Eisenstein, Soviet Union 1924
Brüder brothers, Director: Werner Hochbaum, Germany 1929–On the general strike in the port of Hamburg, Germany in 1896/97
Salt of the Earth, Director: Herbert J. Biberman, USA 1953–Fictionalized account of an actual zinc-miners' strike in Silver City, New Mexico, in which women took over the picket line to circumvent an injunction barring "striking miners" from company property
I'm All Right Jack, Director: John Boulting, UK 1959–Satirical film about the postwar corruption of British industrialists and unions
La Reprise du travail aux usines Wonder, Director: Jacques Willemont France 1968–A short film on the resumption of work after May '68
Ådalen 31, Director Bo Widerberg, Sweden 1969.
Matewan, Director: John Sayles, USA 1987–A fictionalized history of one episode in the labour wars between West Virginia coal miners and mineowners during the 1920s
Bread and Roses, Director: Ken Loach(UK), USA 2000 – A film about janitors fighting for the right to unionize in contemporary Los Angeles
Newsies, Director: Kenny Ortega, USA 1992–A musical loosely based on the New York Newsboys Strike of 1899.
Billy Elliot, Director: Stephen Daldry, (UK) 2000 – story about a young boy in a Northern English town who wants to become a ballet dancer; set on the backdrop of the 1984 Miners' Strike in the United Kingdom.
Babylon 5: In one episode the civilian workers on the station who work the docks for incoming ships go on strike. As they are government employees their strike is considered illegal, and a government negotiator is sent. The way the negotiator deals with the strike helps demonstrate the negative turn politics are taking on Earth.
Hoffa, Director: Danny Devito, United States of America 1992; a story about the rise and fall of Teamster leader James "Jimmy" Hoffa (Jack Nicholson) as told by his loyal associate Bobby Ciaro (Danny DeVito).