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In page Communist Party of Czechoslovakia:

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At local level, KSČ was structured according to what it called "territorial and production principle"; basic party units were organised in work sites and residences where there are at least five KSČ members. In enterprises or communities where party membership was more numerous, smaller units functioned under larger city, village or factorywide committees. Highest authority of the local organisation was, theoretically, the monthly membership meeting, attendance at which was a basic duty of every member. Each group selected its own leadership, consisting of a chairman and one or more secretaries. It also named delegates to the conference of the next higher unit, be it at municipal (like in case of larger cities) or district level.