ment for the protection of the public in the one case, may be quite unreasonable and oppressive in the other.
Occupations which, because of their nature or of the manner in which they are carried on, afford to the unscrupulous peculiar opportunities for defrauding the public, may be regulated according to the necessities of each case. Thus employment agencies may be strictly regulated, on the ground that they deal with a relatively helpless class of customers.
Brazee v.
Michigan, 241 U. S. 340, 343, 36 Sup. Ct. 561;
Adams v.
Tanner, 244 U. S. 590, 37 Sup. Ct. 662. And on the same general theory that the public bargains at a disadvantage with those who carry them on, other occupations or modes of conducting business are subjected to police regulations more or less stringent. For example, emigrant agencies
(Williams v.
Fears, 179 U. S. 270, 21 Sup. Ct. 128); makers of package goods
(Armour & Co. v. North Dakota, 240 U. S. 510, 36 Sup. Ct. 440); dealers in securities
(Hall v.
Geiger-Jones Co., The Blue Sky Cases, 242 U. S. 539, 37 Sup. Ct. 217); retailers offering trading stamps
(Rast v. Van Deman & Lewis, 240 U. S. 342, 36 Sup. Ct. 370); itinerant vendors
(State v.
Feingold, 77 Conn. 326, 59 Atl. 211); cooperative dairies
(Hawthorn v.
The People, 109 111. 302); sales in bulk
(Lemieux v.
Young, 211 U. S. 489, 29 Sup. Ct. 174).
In all these cases the regulation must not be unreasonably in excess of what is necessary to accomplish the supposed end; and in the case of a business in which all citizens have a right and an equal right to engage, the principle of equality of rights must, in this State, be observed.
In applying these general principles to the statute under investigation, it may be said at the outset that no reason appears why producing dairymen should not be able to deal with buyers of milk on equal terms. They