Baal teshuva movement

 https://en.wikipedia.org/wiki/Baal_teshuva_movement

Appearing as an identifiable movement in the 1960s, a growing number of young Jews who had previously been raised in non-religious homes in the United States started to develop a strong interest in becoming a part of observant Judaism; many of these people, in contrast to sociological expectations, became attracted to observant Judaism within Orthodoxy.
Rabbi Yosef Blau the mashgiach ruchani of Yeshiva University has noted:

A baal teshuva movement has emerged with a significant number of Jews from non-traditional homes returning to the observance of grandparents and great grandparents. In fact one of the challenges facing modern Orthodoxy is that many of these returnees are attracted to a European Orthodoxy.^[6]