Judaism
Around the 1st century CE, there were several small Jewish sects: the Pharisees, Sadducees, Zealots, Essenes, and Christians. After the destruction of the Second Temple in 70 CE, these sects vanished. Christianity survived, but by breaking with Judaism and becoming a separate religion; the Pharisees survived but in the form of Rabbinic Judaism (today, known simply as "Judaism"). The Sadducees rejected the divine inspiration of the Prophets and the Writings, relying only on the Torah as divinely inspired. Consequently, a number of other core tenets of the Pharisees' belief system (which became the basis for modern Judaism), were also dismissed by the Sadducees. (The Samaritans practiced a similar religion, which is traditionally considered separate from Judaism.)
Hasidic Judaism
In 2016, a study conducted by Prof. Marcin Wodziński, drawing from the courts' own internal phone-books and other resources, located 129,213 Hasidic households worldwide, about 5% of the estimated total Jewish population. Of those, 62,000 resided in Israel and 53,500 in the United States, 5,500 in Britain and 3,400 in Canada. In Israel, the largest Hasidic concentrations are in the Ultra-Orthodox neighbourhoods of Jerusalem – including Ramot Alon, Batei Ungarin et cetera – in the cities of Bnei Brak and El'ad, and in the West Bank settlements of Modi'in Illit and Beitar Illit. There is considerable presence in other specifically Orthodox municipalities or enclaves, like Kiryat Sanz, Netanya. In the United States, most Hasidim reside in New York, though there are small communities across the entire country. In Brooklyn, Borough Park, Williamsburg, and Crown Heights all house a particularly large population. So does the hamlet of Monsey in upstate New York. In the same region, New Square and Kiryas Joel are rapidly growing all-Hasidic enclaves, one founded by the Skver dynasty and the other by Satmar. In Britain, Stamford Hill is home to the largest Hasidic community in the country, and there are others in London and Prestwich in Manchester. In Canada, Kiryas Tosh is a settlement populated entirely by Tosh Hasidim, and there are more adherents of other sects in and around Montreal.