Its youth branch conducts the student unions in highschools,[17] and the universities of Buenos Aires (UBA),[18] La Plata (UNLP), General Sarmiento (UNGS), Quilmes (UNQ)[19] and Comahue (UNCo).

[20] The PTS also publishes the digital newspaper La Izquierda Diario (the daily left), located among the top 100 most visited websites in the country.

[23] Currently, the PTS defines itself as: «A revolutionary Marxist organization whose theoretical, programatic, and principle basis are found in the legacy of over 150 years of struggle of the socialist and labour movement, the Communist Manifesto, the critiques to the Gotha and Erfurt programmes, the lessons of the Paris Commune, the lessons of the 1905 and 1917 Russian Revolutions, of the First and Second Internationals, the Communist International in its first four Congresses, the struggle of the Left Opposition against the bureaucratization and stalinist thermidor, of the theory-programme of Permanent Revolution, the Transitional Programme and the banners of the Fourth International founded by Leon Trotsky.»The Socialist Workers' Party has presence in several unions.

[32] The PTS was also participant of the struggle of the Lear Corporation workers, which was considered by the CEOs of the main companies in the country as one of the most important conflicts in 2014,[33] which included 240 dismissals, 21 demonstrations in the main highway of Buenos Aires, 16 days of Struggle with pickets throughout the country, 5 repressions, 22 detainees, 80 injured, 16 judicial measures in favor of the workers, two weeks of lockout by the bosses and so on.

[35] After the 2001 crisis, the PTS refused to run candidates for the 2003 elections, calling for boycott and for a "general strike until all of them go and impose a Revolutionary Constituent Assembly”.

In 2009, the PTS participated in a similar coalition named "Front of the Left and the Workers, Anti-capitalists and Socialists" (in Spanish: Frente de Izquierda y los Trabajadores, Anticapitalista y Socialista),[37] achieving the fifth place in important districts such as Córdoba and the Buenos Aires Province, duplicating their votes that year.

The PTS created the Karl Marx Institute for Socialist Thought And the Leon Trotsky Research, Study and Publications Center, the latter of which is recognised as the only one in South America dedicated to publishing and spreading of the Russian revolutionary's works and that of the international trotskyist movement.

[citation needed] Both institutions possess a library of over 3,000 volumes specialized in Marxism and the history of the international and Argentine labour movement and are located in a building in downtown Buenos Aires (Riobamba 144), where courses and seminars are dictated and several research projects are organised.

The PTS has also published several individual works such as the "Lucha de Clases" (class struggle)magazine, having its own contributions written to update fundamental elements of Marxism to contemporary reality.

The Free Cathedra is a series of conferences made to discuss ideologically and whose main subjects have a wide variety of topics, from analising Marxist theory to interpreting current historical phenomena through it.

Since March 24, 2009, the PTS broadcast an Internet TV program called TVPTS,[45] with live transmissions, DVD productions and projections in giant screens.

Since 2012, the PTS made the TV program Giro a la Izquierda (turn to the left),[46] in the city of Córdoba, broadcast through CanalC.