German authorities recently uncovered what prosecutors describe as a Hamas network involved in preparing terrorist attacks in Germany and elsewhere in Europe. The investigation led to a series of arrests and exposed a reality many Europeans have failed to recognize: Hamas was not merely using Europe for recruitment, fundraising, propaganda, and political mobilization. It was also using European soil as part of the infrastructure for planning, supporting, and preparing terrorist attacks. Far from being an isolated case, the investigation offers a glimpse into a much broader network operating across the continent.

In several European countries, Hamas is already a banned terrorist organization. Yet the latest investigation demonstrates a hard truth: banning an organization is not the same as dismantling the network that sustains it. In fact, the investigation highlights a larger problem that extends well beyond Hamas.

Iran’s shadow over Europe

Long before the recent arrests, an extensive network of organizations linked to the Iranian regime had established itself across Europe. Different parts of this network assumed different roles, ranging from recruitment, fundraising, propaganda, and political mobilization to legal warfare, logistical support, and, in some cases, the preparation of terrorist attacks.

One of Europe’s recurring mistakes has been to view Hamas, Hezbollah, the Iranian Revolutionary Guard Corps (IRGC), and other Iranian-backed organizations as separate challenges when in reality, they are often different components of the same strategic architecture. The IRGC has spent decades cultivating, financing, training, and coordinating proxy organizations that pursue Iranian objectives through different methods and under different banners. Hamas and Hezbollah are among the most visible examples.

Other parts of this ecosystem include organizations associated with the Muslim Brotherhood, the Popular Front for the Liberation of Palestine (PFLP), and its affiliated networks such as Samidoun and Masar Badil, as well as groups such as the Hind Rajab Foundation, which has become one of the most prominent examples of legal warfare against Israel. Too often, these organizations are analyzed in isolation. Viewed together, they reveal a highly organized international network that repeatedly leads back to the same common denominator: the Iranian regime.

A Threat to Europe’s Security

The existence of this network did not begin on October 7. However, the massacre significantly emboldened many of the organizations, activists, and support structures aligned with Hamas and its allies. The terror plots uncovered in Europe should therefore not be viewed in isolation, but as part of a broader movement strengthened by what Hamas and its supporters viewed as a victory.

The consequences extend far beyond Israel. The recent investigation exposed preparations for attacks against Jewish and Israeli targets in Europe. For many extremists, the distinction between Israeli and Jewish has largely disappeared. Synagogues, community centers, diplomatic facilities, and individual Jewish citizens have all become potential targets. This is a security challenge for Europe itself.

European authorities have repeatedly uncovered Iranian-linked surveillance operations, assassination plots, and target lists naming specific individuals whom the regime or its operatives wanted silenced or killed. Many of these investigations highlight an uncomfortable reality: without Israeli intelligence, some of these networks and plots might never have been uncovered in time. While Israel long viewed Hamas, the IRGC, Hezbollah, and other proxies as parts of a wider strategic ecosystem, too many European institutions failed to appreciate the scale of the infrastructure developing within their own borders.

Following the Money to the Source

Most importantly, policymakers must follow the money. Again and again, investigations into recruitment networks, propaganda structures, legal warfare campaigns, surveillance operations, and terrorist plots reveal the same underlying reality: Iranian influence, Iranian funding, and Iranian strategic interests. For decades, the Islamic Republic has invested billions in financing, training, equipping, and coordinating proxy organizations throughout the Middle East and beyond. Hamas, Hezbollah, Palestinian Islamic Jihad, and their affiliated actors may operate under different names and employ different tactics, but they frequently benefit from the same source of funding, strategic guidance, and ideological support. Iran does not simply support these groups; it uses them as instruments of power projection and foreign policy.

The message from Germany is clear. Europe’s challenge is not simply preventing the next attack. It is dismantling the network that recruits, finances, coordinates, legitimizes, and ultimately enables terrorism. The most urgent first step is a comprehensive Europe-wide ban on the Iranian Revolutionary Guard Corps (IRGC), accompanied by sanctions targeting its financial networks, front organizations, and support structures. As long as policymakers focus only on individual groups while ignoring the broader architecture that connects them, they will continue to address symptoms rather than the underlying problem.

Sacha Stawski is the President of Honestly Concerned, a German initiative that fights for unbiased media coverage of the Middle East conflict and against antisemitism. Stawski is also heading the pro-Israel advocacy group ILI - I Like Israel.

This op-ed is published in partnership with a coalition of organizations that fight antisemitism across the world. Read the previous article by Adam Milstein.