The RAMJAC Corporation is a fictional multinational conglomerate, or megacorp, featured in several novels by Kurt Vonnegut.
In Vonnegut's 1979 novel, Jailbird, the company, at its height, owns 19 percent of the United States, twice as large as the next largest conglomerate in the "Free World".
According to Jailbird, RAMJAC was established by Jack Graham, a mining engineer from West Virginia, and then passed on to his widow, known to the world as Mrs. Jack Graham (in "reality," the former Mary Kathleen O'Looney, the ex-lover of the book's narrator, Walter F. Starbuck).
Two years after her death (her will being concealed by Starbuck for that time), it was discovered that she had transferred ownership of RAMJAC to the "people of the United States," as part of a misguided attempt to bring about widespread state ownership – Mrs. Graham had been a Communist since college.
RAMJAC is said to have vast holdings in other businesses, including both real companies and media products along with fictional elements: