Protest movements," as the term is used in this discussion, are, as a rule, limited in spatial expansion, being mostly of local, regional, or national character, for example, many "radical" farmers' and peasants' movements. A formally organized protest movement represents one kind of pressure group Transformation of a protest movement into a genuine social movement is possible; the early labor movement showed many traits of a protest movement, and labor unions often a as pressure groups. Neither protest movements nor pressure groups develop, as a rule, a comprehensive political action program or an elaborate ideology, while the relations between social movements and political parties will be discussed later, it should be pointed out that political parties are not necessarily differentiated by ideologies.