Elections of Staff Representatives: When a Judgment Does Not Have Res Judicata for Other Units

Imagine: you are the HR manager in Beaupréau-en-Mauges, and you organise the elections of staff representatives for your site. But a court annuls these elections, ruling that they should have been organised at a broader level, grouping several units. Relieved, you think the decision is final and that other sites can follow the same framework. Wrong! The Court of Cassation has ruled: a judgment that annuls elections for a specific unit does not have res judicata (i.e., final binding force) for another dispute concerning different units, even if the facts are similar.

What does this mean concretely for an employer or a trade union? That each electoral dispute is independent. You cannot rely on a prior decision to organise elections for another establishment without risk of challenge. This 1981 decision, still relevant today, illustrates a fundamental principle of procedural law: the relative authority of res judicata (Art. 1351 of the Civil Code, former Art. 1351).

For non-lawyers, remember this: a court decision only binds the parties to the proceedings and for the specific subject matter of the dispute. If you are faced with a similar situation, do not assume that a prior decision protects you. Each dispute must be analysed independently.

The Facts: An Everyday Story

We are in a large public limited company, organised into several regional directorates and production units. One of these regional directorates and a production unit organised elections of staff representatives separately. A trade union challenges this, and the employment tribunal annuls these elections, ordering new elections within a single framework grouping not only these two entities but also other units, notably those in Strasbourg and Chemillé-en-Anjou.

The company complies and organises elections for the entire perimeter. But then, another dispute arises, this time concerning the organisation of separate elections within each of the Strasbourg and Chemillé-en-Anjou units. The trade union then invokes the first judgment, claiming it has already been decided that the elections must be unified. The company retorts that the judgment only concerned the first two entities, not Strasbourg or Chemillé-en-Anjou.

The conflict escalates to the Court of Cassation. Who is right? The trade union, which wants to apply the same rule everywhere, or the company, which considers that each site must be treated separately? The lower courts (employment tribunal) had sided with the trade union, but the Court of Cassation quashes their decision.

The Reasoning of the Court — Explained

The Court of Cassation relies on the principle of the relative authority of res judicata, set out in Article 1351 of the Civil Code (now Article 1355 since the 2016 reform). This article provides that the authority of res judicata applies only to what has been the subject of the judgment. It requires that the thing demanded be the same, that the claim be based on the same cause, and that the claim be between the same parties, and brought by and against them in the same capacity.

In this case, the first judgment concerned the organisation of elections for the initial regional directorate and production unit. The second dispute concerned different units (Strasbourg and Chemillé-en-Anjou). The subject matter of the dispute was therefore not the same: the elections had not taken place in the same entities. Consequently, the first judgment did not have res judicata for the second.

The Court clarifies that the first judgment did not "exhaust" the issue for all units of the company. Each electoral dispute is independent, even if it raises identical legal questions. The lower courts were therefore wrong to consider themselves bound by the first decision.

This solution is consistent in case law: res judicata is a procedural defence that is strictly interpreted. It cannot be extended to different disputes, under penalty of violating the right to a fair trial (Article 6 of the European Convention on Human Rights).

What This Means for You — Concretely

For employers: if you manage several establishments or units, do not rely on a court decision obtained for one site to organise elections for others. Each dispute must be handled independently. For example, if you are in Chemillé-en-Anjou and the court has annulled the elections of your regional directorate, this does not exempt you from verifying the electoral perimeter for your neighbouring production unit. You risk a new annulment if you mechanically apply the same solution.

For trade unions: if you challenge elections, you must act for each unit concerned. A favourable judgment for one unit does not automatically extend to others. You will need to bring as many actions as there are distinct disputes, even if the legal arguments are the same.

For employees: this means that elections can be organised differently from one site to another, even within the same company. If you believe the electoral perimeter is inappropriate, you must challenge it specifically for your unit.

Imagine a numerical example: a company has 5 units. A first decision annuls the elections of unit A and orders a single perimeter including A, B, and C. The company complies. But for unit D, it organises separate elections. The trade union challenges, invoking the first decision. The Court of Cassation would say that the first decision does not apply to D. Result: two separate disputes, multiplied legal costs, and legal uncertainty that can last several months.

Four Tips to Avoid This Type of Litigation

• Consult a lawyer before organising elections: a professional will help you determine the appropriate electoral perimeter (distinct establishment, economic and social unit, etc.) and prevent challenges.
• Do not assume that a prior decision applies to other units: even if the facts are identical, each dispute is independent. Seek specific legal advice for each site.
• Document each electoral process precisely: keep minutes, electoral lists, pre-election agreements. In the event of a challenge, you will be able to demonstrate that you have complied with the rules specific to each unit.
• If a decision annuls elections, do not generalise: if a court annuls the elections of a unit, execute the decision for that unit only. For others, maintain the status quo until a decision concerning them is rendered.

Further Reading: Related Case Law and Developments

This 1981 decision is part of consistent case law. For example, in a judgment of 14 November 2000 (No. 98-60.271), the Court of Cassation reiterated that res judicata attaches only to what has been decided in the operative part of the judgment. If the operative part mentions only certain units, the others are not affected.

More recently, the Social Chamber specified that the perimeter of the distinct establishment can be challenged at each election, even if a prior decision recognised a certain perimeter (Cass. soc., 11 May 2017, No. 16-60.156). This confirms that each electoral dispute is independent.

Thus, the trend is towards strict respect for the relative authority of res judicata. Judges do not want to freeze the electoral landscape of a company based on a single decision. This ensures greater flexibility, but also legal uncertainty for employers, who must manage multiple disputes.

Checklist Before Acting

• Have I precisely identified the perimeter of the establishment for which I am organising elections? Check whether it is a distinct establishment under the Labour Code (Articles L. 2313-1 et seq.).
• Is there a prior court decision concerning this same establishment? If so, check whether it is final and whether it concerns the same subject matter (same parties, same cause).
• If I am a trade union, should I bring separate actions for each unit? Yes, because a favourable judgment for one unit does not extend to others.
• Have I respected the time limits for challenge? Elections must be challenged within 15 days following the proclamation of results (Art. R. 2314-24 of the Labour Code). After this period, the challenge is inadmissible.
• Have I consulted a specialised lawyer? In electoral law, procedural subtleties are numerous. A prior consultation can avoid many pitfalls.

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