What do they mean by writing that “the germ of an odious aristocracy” had been planted in the united states?

Freedom of thought, and a free communication of opinions by speech through the medium of the press, are the safeguards of our Liberties. . . . By the freedom of opinion, cannot be meant the right of thinking merely; for of this right the greatest Tyrant cannot deprive his meanest slave; but, it is freedom in the communication of sentiments [by]speech or through the press. This liberty is animprescriptable [unlimitable] right, independent of any Constitution or social compact; it is ascomplete a right as that which any man has to the enjoyment of his life. These principles are eternal--they are recognized by our Constitution; and that nation is already enslaved that does not acknowledge their truth. . . .If freedom of opinion, in the sense we understand it, is the right of every Citizen, by what mode of reasoning can that right be denied to an assemblage of Citizens? . . . The Society are free to declare that they never were more strongly impressed with . . .the importance of associations . . . than at the present time. The germ of an odious Aristocracy is planted among us--it has taken root. . . . Let us remain firm in attachment to principles. . . . Let us be particularly watchful to preserve inviolate the freedom of opinion, assured that it is the most effectual weapon for the protection for our liberty. :)