Wicca is not limited to groups or covens . Wicca does not worship any being known as saitan or the Devil nor do we worship demons. After many years of study many Wiccans come to the understanding that all our Gods and Goddess are simply a personified view of the hightest exsitance of God and not any of those that are commonly associated with harm, evil, or negativity that many christans believe are worshipped. Wicca does not sondone the harm of others. Even when they may deserve it or others feel it is justified.
Most people understand Black magic as magic that is practiced to cause harm.
We do not believe or condone these practices. Wicca is not a religion of actions without consequence. Modern Witches do not believe in drinking or drawing blood. History reveals many diffrent cases where the blood of others or of animals was a part of various rituals. With the changes of time and conciousness on various issues old practices have been set aside.