The Czechoslovak Union of Youth had a tumultuous history during the late 1960s and 1970s. As a feeder organization for the KSČ, it faced many of the same problems the party faced in recruiting members. In the mid-1960s, less than half of all 15- to 25-year-olds were members; in the mid-1970s, fewer than one-third had joined. As in the case of the KSČ, those who joined tended to do so with their future careers in mind; secondary school and university students were overrepresented, while only a fraction of the eligible industrial and agricultural workers belonged. Furthermore, a single, centralized organization was simply an inadequate vehicle for the interests of such a diverse group. During the reform era, the Czechoslovak Union of Youth split into a number of independent associations, including the Union of High School Students and Apprentices, the Union of Working Youth, and the Union of University Students. It was not a development the party found suitable, and beginning in 1969 party leaders set about reconstituting a unified movement. During the same era, the 1968 invasion spawned a number of dissident youth organizations. In the early 1970s, these were all infiltrated and repressed by the KSČ, a policy that continued throughout the 1980s.