Our research has identified at least two networks associated with
Hezbollah growing at an alarming rate in Latin America. One is
operated by Hezbollah itself, aided by its collaborators,
particularly from Venezuela. Another is managed by a cadre of
notorious operatives on behalf of the Iranian Qods Force. These
networks conduct fund-raising, money laundering, narcotics
trafficking, proselytization, recruitment, and training in the
Americas. We can identify more than 80 operatives in at least 12
countries throughout the region, with the greatest areas of concern
being Brazil, Venezuela, and the Southern Cone.
https://www.govinfo.gov/content/pkg/CHRG-112hhrg72255/html/CHRG-112hhrg72255.htm
They seem to be pretty active considering that they have 80 operatives in at least 12 countries in the region. That report was written in 2011.
While Hezbollah remains very active in South America, authorities in
several countries now work together, across borders, targeting
Hezbollah activities. In recent years, authorities have thwarted
Hezbollah plots in Bolivia, Chile, Colombia, and Panama. And in
2019, Argentina formally designated Hezbollah as a terrorist
organization and froze its assets. The designation was the first by
any country in Latin America, but was followed in short order by
Colombia, Honduras, and Guatemala.
https://www.washingtoninstitute.org/media/5379
More recently, a former Wexler Fellow, Washington Institute for Near East Policy, commented in 2023 that Hezbollah is very active in South America.
They're mainly there to finance their operations and carry out terrorist activity against Israel.