Sept. 28, 1961 - An official of the Central Intelligence Agency has testified that fomenting riots, infiltrating police forces, and trying to turn the public against the police were favorite Communist tactics. The witness was Lyman B. Kirkpatrick Jr., inspector general of the CIA. He told of the seizure, in Europe, of a Communist handbook teaching techniques for riots against the police. Few demonstrators engaging in a riot realize they are being led and used by trained Communists, Mr. Kirkpatrick told a Senate subcommittee. He said that the Communists wanted it that way. The reason for fomenting riots, he said, it to cause turmoil that skilled Communist propagandists turn to their advantage.