There were subbotniki and voskresniki in USSR. On Saturdays and Sundays people volunteered to do unpaid work. It was widespread de-facto obligatory work organised by organisations employing people, educational institutions and schools. This work was done each spring. There were occasions when people were doing unpaid work on Easter.
Subbotnik and voskresnik (from Russian: суббо́та, IPA: [sʊˈbotə] for Saturday and воскресе́нье, IPA: [vəskrʲɪˈsʲenʲjɪ] for Sunday) were days of volunteer unpaid work on weekends following the October Revolution. Initially they were indeed volunteer, but gradually de facto obligatory upon announcement, as people quipped, “in a voluntary-compulsive way” (в добровольно-принудительном порядке).
Thousands of clergy were jailed or executed in the 30s and 40s. Thousands of churches and cathedrals were exploded or used for warehouses and other purposes. Certain workers were ashamed to baptise their children taking them for baptism to other cities.
USSR anti-religious campaign
Persecution of Christians in the Soviet Union