People stand in groups to show they want change. 

Sometimes workers stand in groups outside a workplace. 

This can help workers ask for changes. They want to make things better at work. They may try to stop others from going in. This puts pressure on the business.
Some groups use many people at once. This is called a mass picket. It shows that many people agree. It is a way to speak up together.
Picketing is a way for people to protest. 
Some pickets are for sharing news. We call this informational picketing. It helps the public learn about a cause. Nurses sometimes use this to protect their work. 
Other pickets can be more active. Flying pickets move quickly from place to place. This can be hard for a big business to stop. Some pickets target other businesses too. This is called secondary picketing. In the United Kingdom, some of these types are against the law. In the United States, laws like the Taft-Hartley Act of 1947 made some picketing illegal. 
Picketing is a way for groups to show they disagree with something. 
There are many different ways to picket. Informational picketing is a legal way to raise awareness. This helps the public learn about a cause that matters to a group. Nurses often use this method outside of hospitals. For example, nurses at UMMHC held events in April 2006. They wanted to protect their nursing program. A mass picket is another type that uses a very large group. This shows a lot of support for an idea. 
Some pickets move around very quickly. These are called flying pickets. They can show up at different business locations fast. This was used in a big miners' strike in Britain in 1969. Other groups use secondary picketing to target related businesses. This means picketing at a supplier or a store that sells a company's goods. In 1972, striking miners in England picketed a coke works in Birmingham. Many other workers joined them during the Battle of Saltley Gate. 
Laws about picketing have changed a lot over time. In the United States, the Norris-La Guardia Act of 1932 helped workers. It made it harder for bosses to use courts to stop strikes. Later, the Taft-Hartley Act of 1947 made mass picketing illegal in the U.S. In the United Kingdom, laws also changed many rules. The Employment Act of 1980 changed rules for secondary picketing. The Conservative government under Margaret Thatcher passed laws to ban it later. 
Picketing can sometimes become very disruptive or even violent. Some pickets might physically block people or goods from moving. At times, picketing can lead to police intervention if it breaks public order. During the UK miners' strike from 1984 to 1985, some people used stones or paint. This kind of behavior is not peaceful and can lead to arrests. Different countries have different rules for how people can protest. They must balance the right to speak with the rights of others. Laws often depend on how the picketers act and what they say.
Picketing is a specific form of protest where people, known as picketers, congregate outside a workplace or an event. 
There are several distinct types of picketing used in labor and social movements. Informational picketing is a legal method used to raise public awareness about a specific cause. A labor or trade union typically uses this to inform the public about their concerns. For example, nurses at UMass Memorial Medical Center held informational pickets in April 2006. They did this to protect the quality of their nursing program and to promote bargaining with management. This type of picketing is often used to gain public support for a cause.
Other methods involve much larger groups or more strategic movements. A mass picket occurs when as many people as possible gather at a single picket line. This is used to demonstrate massive support for a cause at a symbolically important workplace. However, if the numbers are too large, a mass picket can become an unlawful blockade or an aggravated trespass. Another method is the use of flying pickets. These are highly mobile groups that can arrive at different business locations very quickly. This tactic was used strategically during the 1969 miners' strike in Britain. 
Some picketing extends beyond the primary workplace to include related entities. This is known as secondary picketing. It involves targeting an external entity that is economically connected to the main business. This might include suppliers, retailers that sell the products, or even the homes of majority shareholders. A famous historical example is the Battle of Saltley Gate in 1972 in England. During this event, striking miners picketed a coke works in Birmingham. They were later joined by thousands of workers from other local industries.
Picketing can also become disruptive or even violent, which changes its legal status. Obstructive picketing physically narrows or stalls the flow of people, goods, or services. If picketers violate public order, they may face enforcement from the police or local authorities. In some extreme cases, picketing can become criminally violent. This involves the use of force, such as battery or assault, to intimidate people. During the UK miners' strike from 1984 to 1985, some picketers pelted strikebreakers with stones, paint, and brake fluid. These actions led to many arrests for offenses against the person.
Laws governing picketing have evolved significantly through various political shifts and legal rulings. In the United States, the Norris–La Guardia Act of 1932 was a major turning point. It limited the ability of employers to use court injunctions to stop strikes. Later, the Taft–Hartley Act of 1947 outlawed mass picketing and secondary picketing in the U.S. In the United Kingdom, the legal landscape changed through several acts. The Employment Act of 1980 addressed secondary picketing, and later laws passed under Margaret Thatcher's government banned it entirely. 
Today, the legality of picketing is a complex balance of competing rights. Courts must often weigh the right to freedom of expression and religion against the rights of a business to avoid disruption. For instance, religious groups like the Westboro Baptist Church may picket storefronts to protest what they consider sinful. 
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