In criminal law, a conspiracy is an agreement between two or more persons to commit a crime at some time in the future. Criminal law in some countries or for some conspiracies may require that at least one overt act be undertaken in furtherance of that agreement, to constitute an offense.There is no limit on the number participating. For the purposes by one or more parties does not affect liability (unless, in some cases, it occurs before the parties have committed overt acts).Prosecutors choose to name persons as unindicted co-conspirators for a variety of reasons including grants of immunity, pragmatic considerations, and evidentiary concerns.Report No. 76 on Conspiracy and Criminal Law Reform, produced a statutory offence and abolished all the common law varieties of conspiracy, except two: that of conspiracy to defraud, and that of conspiracy to corrupt public morals or to outrage public decency.