29 C.F.R. § 452.132 Proxy voting.
Title 29 - Labor
There is no prohibition on delegates in a convention voting by proxy, if the constitution and bylaws permit.
Title 29: Labor
PART 452—GENERAL STATEMENT CONCERNING THE ELECTION PROVISIONS OF THE LABOR-MANAGEMENT REPORTING AND DISCLOSURE ACT OF 1959
Subpart I—Election Procedures; Rights of Members
§ 452.132 Proxy voting.