In the 1988 presidential elections, the PSU supported the communist dissident candidate Pierre Juquin, who obtained 2.1% of the votes in the first round.
The dissident Republican candidate for mayor, John J. Kelly 3rd, won with 50 percent of the vote.
Julien Balkany, a member of the Union for a Popular Movement, will stand as a dissident candidate, having failed to obtain the party's endorsement.
Under that proposed rule, the dissident candidates would appear on the same ballot as the candidates backed by the board, and shareholders would choose.
Socialist candidate Daphna Poznanski-Benhamou finished first, ahead of a divided right with strong dissident candidates.
Another dissident candidate was previously elected.
Three dissident candidates were not opposed.
A front-page article on March 16 about board elections for the Sierra Club described dissident candidates who favor restrictions on immigration.
In a break from previous years, at least two dissident candidates sought seats on the firm's board this year.
Mark Seddon, editor of the left-wing weekly Tribune and a successful dissident candidate for the party's national executive committee, complained that party members were being turned into "identikit robots."