Which act of Congress extended the government's authority to block horizontal and vertical mergers?

Question

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The Celler-Kefauver Anti-Merger Act, passed in 1950, extended the government's authority to block horizontal and vertical mergers by prohibiting any mergers that would "substantially lessen competition" or "tend to create a monopoly." This act also closed a loophole in the Clayton Act that allowed companies to merge through acquiring the assets of another company rather than the stock.

Which Act of Congress Extended the Government's Authority to Block