RUSSIAN COLLUSION, BEFORE TRUMP LOWERED THE TONE OF OUR POLITICS: Eliot Spitzer snuck me into his apartment in a suitcase: ex-mistress.

Former Gov. Eliot Spitzer used to smuggle his Russian-escort mistress into the luxury Upper East Side home he shared with his wife — by stuffing her inside a piece of luggage, she told The Post.

“He used to sneak me into his Fifth Avenue apartment in a black suitcase . . . when his wife was away,’’ Svetlana Travis Zakharova told The Post in an exclusive interview.

“My knees would be up by my face. When the doorman would ask if he could help, Eliot would say, ‘No, thanks.’ ” . . .

She said their relationship lasted so long because the pinstripe-loving former politician was a “sexual deviant’’ — and “his wife and other girlfriends wouldn’t do things.

“He complained about [another girlfriend] — he said she was annoying,’’ Zakharova said.

At one point, the gal pal “wanted him to reverse his vasectomy. He told her he would, but he didn’t.”

Zakharova said the hot-to-trot ex-gov loved sex toys, “but he wouldn’t go to the store because he was afraid of being recognized.

“He used to make me buy sex toys, dildos . . . and long-term [erection] gel . . . a leash with a choker . . . I would throw them out after we used them and then buy new ones the next time we were together,’’ she said.

“We were seeing each other four times a week’’ for sex, said Zakharova, who has previously described leading Spitzer around on a black leash during their bedroom games.

“He would tie me up and call me names — ‘a b—h.’ He would say, ‘I’m going to kill you.’