The LJCC was an organization guided by the ideology of Marxism-Leninism that oriented its actions towards building unions and agrarian leagues with broad youth participation.

Between 1956 and 1959, three National Union of Colombian Students (UNE) congresses were held, originally uniting communists and liberals, but eventually remaining under the leadership of the JUCO.

In July 1961 the Third National Conference of the Communist Youth of Colombia met clandestinely to discuss and approve the "Line of the Masses".

[8] In 1965, the Fifth Plenary Meeting of the Central Committee of JUCO expelled what they called "factionalists" from within (Francisco Garnica and Fred Kaim, among others) who defended the Chinese Communist Party and its ideology.

The 11th Congress, lasting November 8 to 11, presented the "Youth for a New Homeland" Platform (Spanish: Plataforma Juvenil por la Patria Nueva).

In 2008, its 13th National Congress ("In the struggle for democratic peace, there is the youth of Colombia") was held, its main bets revolved around strengthening the calls for a negotiated exit in the Colombian Conflict.

[9] Recently, JUCO has been the subject of multiple accusations in cases of gender-based violence involving some of its members and have been publicly working to fix the issue.

To this end, the organization has been working on feminist training and strengthening of the political line to facilitate the purging of sexist 'machista' and patriarchal practices in its ranks.

[citation needed] In recent years, the JUCO has mobilized to accompany citizens in various exercises of protest in numerous regions following a strong onslaught against social leaders in Colombia and the continued presence of strengthening paramilitaries.