The ​f​eds ​busted a ring of self-proclaimed psychics, filing an action Thursday to freeze their allegedly crooked — and immensely profitable — postal activities.

The 13 defendants engaged in “numerous predatory mail-fraud schemes, targeted primarily at the elderly and vulnerable,” earning $50 to $60 million annually, the Justice Department says in its suit.

The diviners mail millions of solicitations annually, pretending to be learned scholars and world-renowned psychics, charging $50 to $55 in exchange for a fictitious windfall or a talisman, the feds said. If victims get anything in return, it’s often a cheap trinket, the suit alleges.