A more thorough explanation:

Definition: Pia fraus is a Latin term that means "pious fraud." It refers to a deceptive act that is considered morally justifiable, especially when it is done in the interest of a religious institution. For example, a church may circumvent the mortmain statutes, which restrict the transfer of property to a religious organization, by using a pia fraus.

Definition: A picaroon is a person who robs or plunders others.

Definition: Pickery is a term used in Scots law to refer to petty theft.

Definition: Picketing is a form of protest where one or more people demonstrate outside a business or organization to protest their activities or policies. It is often used by employees to publicize a labor dispute and pressure the employer to meet their demands.

Examples:

• Common-situs picketing: This is when union workers picket a construction site, even if they have no direct dispute with the site. This is illegal.
• Informational picketing: This is when picketing is used to inform the public about a matter of concern to the union.
• Organizational picketing: This is when a union pickets in an effort to persuade the employer to accept the union as the collective-bargaining agent of the employees.
• Secondary picketing: This is when a party pickets an establishment with which they have no direct dispute in order to pressure the party with which there is a dispute.
• Unlawful picketing: This is when picketing is carried out in violation of the law, such as when picketers use threats or violence to dissuade other employees from returning to work.

These examples illustrate the different types of picketing and how they can be used in labor disputes. Common-situs picketing is illegal because it can disrupt the work of other parties who have no direct dispute with the picketers. Informational picketing is a way to inform the public about the issues at hand. Organizational picketing is used to persuade the employer to recognize the union as the collective-bargaining agent. Secondary picketing is controversial because it can affect parties who have no direct involvement in the dispute. Unlawful picketing is always illegal because it involves breaking the law.