Witches are also believed to have powers that cause harm to other people covertly. Healer-sorcerers who practice this kind of sorcery usually justify it as a form of criminal punishment, as a widespread belief is that black magic does not work on people who are innocent. Their targets are usually "wrongdoers" like thieves, adulterous spouses, or land grabbers. There are also "true" sorcerers who are said to have hereditary sorcerous powers. Unlike healers, they do not consider the justice of their actions. The latter type of sorcerers are often conflated with the evil supernatural beings capable of appearing human, like "aswang" and "manananggal".