Okla. Stat. tit. 15, § 15-598.10: Trade association may sue

Any duly organized and existing trade association, whether

incorporated or not, is hereby authorized to institute and prosecute

a suit or suits for injunctive relief and costs, provided for under

the terms of this act, as the real party in interest for and on

behalf of one or more of said association's members, when violation

of this act directly or indirectly affects or threatens to affect or

injure such member or members, or where violation of this act

threatens to impair fair competition or otherwise affects such

member as herein provided.