Gary Allen, an author whose books ''None Dare Call It Conspiracy'' and ''Tax Target: Washington'' articulated conservative goals for the past two decades, died Saturday of a liver ailment. He was 50 years old.
Mr. Allen started and mastered the technique of spreading the conservative message through mail-order books, cassettes and film strips, said W. Scott Stanley, editor in chief of the Washington-based Conservative Digest. Addresses from the mail orders were placed on mailing lists, forming an important network for conservative causes and fund raising, Mr. Stanley said.
Mr. Allen's most popular book, ''None Dare Call It Conspiracy'' published in 1971, expounded the conservative theory that international banking and politics control domestic decisions, taking them out of elected officials' hands.
He was a contributing editor to the Conservative Digest and the John Birch Society's American Opinion magazine. He also wrote speeches for former Gov. George Wallace of Alabama during Mr. Wallace's Presidential campaigns and advised the conservative Texas millionaire Nelson Bunker Hunt, Mr. Allen's son, Mike, said.