In the late 1990s, Microsoft was sued for "tying" its Internet browser, Internet Explorer, to its operating system. A seller forcing you to buy a product that you don't want before you can purchase one that you do want, or tying, is prohibited by what act

Section 3 of the Clayton act.

Explanation:

Section 3 of the Clayton act 15 U.S.C.S § 14, makes illegal some kind of distribution practice that facilitates monopolistic arrangement that is section 3 of the Clayton act makes it illegal to enter into tying arrangement, exclusive dealing contracts or requirement contracts if such contracts tends to lessen competition. Where customer is required to pay for an undesired product in order to obtain a desired product.

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