In force since Mar 6, 2026
Blockading a site: now a very serious infringement, with a penalty
Ley 27.802, ss. 139, 145 and 147 (Title XV)
in forceNATIONAL
Labor
Derives from: The comprehensive labor reform is now law
Section 20 ter of Ley 23.551 lists it among the three very serious infringements: fines of up to five times the maximum and loss of trade-union status for repeat offending.
The other rules on this subject21
The comprehensive labor reform is now lawLey 27.802 (Official Gazette, Mar 6, 2026, promulgated by Decreto 137/2026)in force
Hire formally for 4 years with employer contributions of 2%+3%Decreto 315/2026 (Official Gazette, May 4, 2026), Ley 27.802 Title XXin force
Labor reform regulated: registration with ARCA, digital pay slip and the end of ultra-activityDecreto 407/2026 (Official Gazette, Jun 1, 2026)in force
What changed and who it applies to
What changed
The new section 20 ter of the Trade Union Associations Act 23.551 lists three very serious infringements, and the second is written for what happens on a site: "Causing, and/or inciting and/or organising the blockade or occupation of a workplace; preventing or obstructing, wholly or partly, the entry or exit of persons and/or goods to the workplace". The other two: "impairing the freedom to work of those who do not join industrial action through acts and/or deeds and/or intimidation or threats", and causing damage to persons or property — of the company or of third parties, inside or outside the workplace — "or unduly retaining it". The new section 53 bis turns all of that into an "unfair practice" and adds seven more: compulsory affiliation, direct or indirect; "coercive mechanisms" — against workers and against employers, in two separate subsections; reprisals against those who do not join; refusing to bargain collectively or stalling the negotiation; and failing to comply with mandatory conciliation. And section 55 sets the penalty, which is the part that changes the calculation: fines under the Ley 25.212 regime, raisable to five times the maximum where there are multiple practices or repeat offending, capped at 20% of what the union collects in dues in the month of the infringement, with an automatic 10% surcharge every five days of delay while non-compliance continues. The final sentence is the heaviest: if the conduct recurs, "the Justicia Nacional del Trabajo may revoke its trade-union status and/or registration". verif Mar 6, 2026 ↗
In force
In force with the law, from 6 March 2026. With a caveat worth not skipping: the definition of the infringement and its classification as an unfair practice are operative, but section 20 ter itself refers to "the penalties established by the regulation" and to the procedure the Enforcement Authority lays down. The section 55 fine, by contrast, is applied by a judge and rests on a regime that already exists (Ley 25.212). verif Mar 6, 2026 ↗
Who it applies to
Whoever signs a works contract with a deadline and late penalties, which is every contractor on a large project thesis. The law defines as a very serious infringement causing or organizing the blocking or occupation of a workplace and preventing or obstructing, totally or partially, the entry or exit of people or goods; subsection c) of article 20 ter also covers damage to third-party property, or its undue retention, whether or not it is inside the workplace; and it protects the freedom to work of those who do not join industrial action, with an unfair-practice subsection of its own against reprisals verif. Those categories were already in DNU 70/2023 verif, whose labor chapter was suspended by the courts prob; now a law sets them. In Vaca Muerta or at a high-altitude mine, a blockade is what can stop a drilling rig, leave a loaded truck outside the field or freeze an assembly, and the haulier whose truck is held at the gate of someone else's site is covered as a third party thesis. verif Mar 6, 2026 ↗
The norm
Ley 27.802 on labour modernisation, Title XV ("Amendments to ley N° 23.551 – Trade Union Associations"), sections 139 (new s. 20 ter), 145 (new s. 53 bis) and 147 (new s. 55). Enacted on 27 Feb 2026, promulgated by Decreto 137/2026 and published in the Boletín Oficial on 6 Mar 2026. verif Mar 6, 2026 ↗
Our reading
thesis What changes is not that blockading a site is now frowned upon: it is what the penalty rests on. Fines can be paid and provisioned for; trade-union status cannot — it is the union's condition of existence as a counterpart, and section 55 puts it on the table for the repeat case. ⇒ For a project under construction, the useful reading is that the expected cost of a blockade has shifted sideways: it used to be borne by whoever wanted to produce, in lost site days; now it has a counterpart that whoever blockades also has to price. It is R10 in its least obvious form — the barrier being removed is neither fiscal nor administrative, it is execution risk, and that risk is what makes a schedule, and the debt financing it, more expensive. What could break this reading, and this is the honest part: a category without a regulation is a category that has not yet been applied. Section 20 ter refers to the regulation for penalties, and until there is a decided case this is a written rule, not a tested one. The proof of whether it works does not come from the Boletín Oficial: it comes from the first blockade that ends in a ruling. thesis
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Where it lands, province by province1
Neuquén This is the province where the risk this rule names carries a price: the schedule of a well or an assembly in Vaca Muerta is financed against deadlines, and blocked access is what breaks them. That obstructing the entry or exit of goods is now defined, and that repeat offending can cost trade-union status, changes both sides' calculation before they sit down to negotiate. favorable cheaper to respond: investing takes time, held-back supply shows up at once thesis
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Analysis and curation: Ignacio Aredez
Head of Despegue
Method and track record →- 20+ years in technology, 15 of them in data and AI, for clients across Europe and the Americas
- Certified in AI governance (ISO/IEC 42001)
- Machine Learning (Google Cloud)
- Registered expert with the European Commission
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verif primary source · prob primary source pending · unconf a source said it · estim our own calculation · thesis our reading · the date belongs to the datum, at the precision its source allows