They show a larger proportion with skilled, professional and commercial training and experience than do any of the other newer immigrants except the Finns. Nearly twenty per cent. of the Hebrew immigrants are tailors, nearly five per cent. mechanics, merchants, or clerks, and almost one per cent. follow the professions. Of the remainder a very considerable proportion, though not a majority, are skilled workers such as bakers, tobacco workers, carpenters, painters, and butchers. The garment trades, to which they find themselves adapted, and for which New York is the world center, engages perhaps 100,000 of them, men, women, and children, many of them in the sweat-shops, which they created. For the first time in their history, the Jews have built up a great industrial class, this being an American development. According to a Jewish authority,[69] the "unspeakable evils of the tenements and sweat-shops" of the ghetto are undermining their physical and moral health. [Sidenote: Location] The newly arrived Russian Jew is kept in the ghetto of the larger cities--New York, Chicago, Philadelphia, and Boston--not only by his poverty and ignorance but by his orthodoxy. In this district the rules of his religion can more certainly be followed. Here can be found the lawful food, here the orthodox places of worship, here neighbors and friends can be visited within "a sabbath day's journey." The young people, however, rapidly shake off such trammels, and in the endeavor to be like Americans urge their parents to move away from this "foreign" district. When they succeed, the Americanizing process may be considered well under way. Concerning the religious change that comes over the young Jew after he reaches this country, a writer says:[70] [Sidenote: Become Estranged from Judaism]