The other eight unions have already signed deals with him.
So far, the union has signed contracts with only seven of the city's greengrocers.
The union has signed with nine other companies while 10 others have unexpired contracts.
Sometimes a union will strike rather than sign an agreement with a no-strike clause.
The union signed its first collective bargaining agreement with Pemex in 1942.
The Soviet Union signed the agreement shortly before its collapse.
Thanks in large part to the merger, the union signed a contract with the company in 1980 on behalf of 4,000 workers.
Why did the two unions sign the agreement?
The Soviet Union signed the agreement to build the twin reactor plant in 1976.
In 1985, the unions signed a far-reaching agreement with management to modernize work practices.