Hamas is a Palestinian political and military organization, which some countries recognize as a terrorist group. It has received support from several countries, including Iran, Syria, and North Korea over the years according to various reports. If U.S victims of attacks allegedly carried out by Hamas are suing these countries, it could be for the believed assistance that these countries have allegedly provided to Hamas.
Legal actions of this nature can be complex, as they involve interpretations of international law, state support for terrorism, and the particular facts of the individual attacks. Usually, the plaintiffs in such cases hope to receive compensation for their losses and to hold the governments accountable for their alleged roles in supporting terrorism.
However, the specifics of this case, such as the name of the victims, the nature of the October 7 attacks, and the current status of the lawsuit, would not be information that I can provide.