1974 The gray wolf placed on the endangered list.

The Gray Wolf (Canis lupus) placed on the endangered list Friday January 4, 1974 – Federal Register – Vol. 39, No 3 – § 17.12 Endangered native wildlife. (Pg 1175)
Taking, Possession, Transportation, Sale, Purchase, Barter, Exportation and Importation of Wildlife. .

Common Name and Scientific Name
Eastern Timber Wolf (Canis lupus lycaon)
Northern Rocky Mountain Wolf (Canis lupus irremotus)
Red Wolf (Canis rufus)

After consultation with the appropriate States and after having reviewed the advice and recommendations of interested persons and organizations as appropriate, the Secretary has determined, in accordance with the provisions of 16 U.S.C. 668aa(c), the following species or subspecies of native wildlife to be threatened with extinction within the territory of the United States. The presence of a trinominal (third word) in the
“scientific name” column identifies that animal as a subspecies. The “common name” column contains the most generally accepted names in the English language. When two or more common names for a species are in common usage, the most widely used one is placed first, followed by others in parentheses. The public should be aware that common and commercial names may vary from local usage. If one or more subspecies of a species are listed, it indicates that the species as a whole is not endangered although the named subspecies are.