Samsung Bioepis Union Invokes Yellow Envelope Law to Target

The Union That Won’t Stop at the Subsidiary

The Samsung Bioepis Solidarity Labor Union has done something unprecedented in Korea’s tightly structured chaebol system: it is demanding that Samsung Electronics, the group’s electronics and semiconductor powerhouse, sit at the same bargaining table over pay.

The dispute began in April over a 15% payout of operating profit as performance bonuses. After months of stalled talks, the union announced a second three‑week general strike starting October 26. Now it has pivoted to a legal weapon—the so‑called yellow envelope law—to pull Samsung Electronics into the fray.

The union argues that Samsung Electronics, which holds 31.22% of Samsung Bioepis, exercises substantial control over human‑resources and compensation policies. It points to a “business‑support task force” (now a permanent office) within Samsung Electronics that, the union claims, has long involved itself in hiring, evaluation, and grade‑setting at the biosimilar maker.

Samsung Electronics denies the allegation. It says the support office merely receives updates and provides advisory services, without intervening in subsidiary management.

If the union’s claim succeeds, it would redraw the line between group headquarters and affiliated companies—a line that has historically insulated Samsung Electronics’ core semiconductor operations from labor pressure aimed at subsidiaries.

Why the Yellow Envelope Law Matters

The legal lever is Article 2(2) of Korea’s amended Labor Union Act, which expanded the definition of “employer” to include any party that can substantially and concretely determine working conditions, even if it is not the formal contracting party.

This clause was born from years of complaints about subcontracting chains, where real decision‑making power rested with a parent or client rather than the nominal employer. Critics called it the “yellow envelope law” because it effectively hands workers a yellow envelope—a symbol of the labor ministry—to file complaints against hidden controllers.

Samsung Bioepis union lawyers are now applying that logic to a intra‑group relationship: a parent company’s influence over a subsidiary’s labor practices.

Labor law expert Park Ji‑soo of Korea University’s Graduate School of Law cautions that “strategic decision‑making by a holding company or group control tower alone may not be enough to recognize substantial employer status.” The threshold, he says, requires proof of direct, concrete control over daily working conditions.

That is a high bar. But the union’s strategy is not solely about winning in court. It is about shifting the balance of power in an ongoing wage dispute.

The Real Stake: Samsung Electronics’ Semiconductor Shield

Samsung Electronics is globally recognized as a leader in memory chips and foundry manufacturing. Its workforce, while large, has been relatively insulated from the kind of collective‑bargaining battles that have rocked other sectors of the Korean economy.

Samsung Bioepis is a joint venture with Amgen, but Samsung Electronics remains the dominant shareholder. A successful claim that Samsung Electronics controls Bioepis’s labor policies would create a legal precedent. It could open the door for other Samsung subsidiaries—especially those in high‑tech manufacturing—to bring Samsung Electronics into labor disputes over pay, working hours, and safety.

That would be a strategic loss for Samsung Electronics. The company has spent decades maintaining a clear firewall between its semiconductor business and the labor activism that has periodically surfaced in its consumer‑electronics and display divisions. Breaking that firewall would complicate negotiations across the entire group.

It would also signal to other Korean conglomerates that the yellow envelope law can be used not just against subcontractors, but against the very top of the chaebol pyramid.

Who Wins, Who Loses?

For the Bioepis union, the move raises the stakes. If Samsung Electronics is forced to negotiate, the union gains access to deeper pockets and greater influence over group‑wide policy. A settlement could include not only higher bonuses but also changes to group‑level labor standards.

For Samsung Electronics, the risk is reputational and operational. Defending itself in a labor‑relations case could distract from its semiconductor strategy at a time when global chip demand is volatile. More importantly, a loss could embolden workers at other Samsung affiliates to file similar claims, triggering a wave of intra‑group labor litigation.

For the chaebol model, the implication is structural. The yellow envelope law was designed to pierce the veil of subcontracting. Its expansion to intra‑group control challenges the notion that parent companies can remain distant from the labor practices of their affiliates—a notion that has long shielded Korea’s largest families from direct accountability.

What Happens Next

The union has outlined a two‑track strategy: continue the strike while preparing to file a complaint with the Korea Labor Relations Commission. If the commission finds that Samsung Electronics qualifies as an “employer” under the law, it could order the company to participate in collective bargaining.

Samsung Electronics is expected to fight the classification aggressively. Legal scholars note that the law’s language is still being tested in court, and outcomes will depend on how much evidence the union can present about day‑to‑day control.

Even if the union loses the legal battle, it may have already achieved its goal: forcing Samsung Electronics to acknowledge that its subsidiaries’ labor disputes are no longer contained within the affiliate walls.

The next few weeks will show whether the yellow envelope law can bend the chaebol’s most fortified fortress—or whether Samsung Electronics can hold the line.