A significant number of non-sanctioned churches and temples exist, attended by locals and foreigners alike. Unregistered or underground churches are not officially banned, but are not permitted to openly conduct religious services. These bodies may face varying degrees of interference, harassment, and persecution by state and party organs. In some instances, unregistered religious believers and leaders have been charged with "illegal religious activities" or "disrupting social stability." Religious believers have also been charged under article 300 of the criminal code, which forbids using heretical organizations to "undermine the implementation of the law." An extrajudicial, Communist Party-led security organ called the 6-10 Office oversees the suppression of Falun Gong and, increasingly, other unregistered religious organizations.