From the auto workers:

Strike in Iran Khodro: We declare our solidarity with the movement of the people of Iran. Autoworker, Fellow Laborers (Laborer Friends): What we witness today, is an insult to the intelligence of the people, and disregard for their votes, the trampling of the principles of the Constitution by the government. It is our duty to join this people's movement. We the workers of Iran Khodro, Thursday 28/3/88 in each working shift will stop working for half an hour to protest the suppression of students, workers, women, and the Constitution and declare our solidarity with the movement of the people of Iran. The morning and afternoon shifts from 10 to 10:30. The night shift from 3 to 3:30. Laborers of IranKhodor

And an excerpt from the bus workers (read the whole thing at The Field):

The fact that the demands of the vast majority of Iranian society go far beyond those of unions is obvious to all, and in the previous years we have emphasized that until the principle of the freedom to organize and to elect is not materialized, any talk of social freedom and labor union rights will be a farce. Given these facts, the Autobus Workers Union places itself alongside all those who are offering themselves in the struggle to build a free and independent civic society. The union condemns any kind of suppression and threats. To recognize labor-union and social rights in Iran, the international labor organizations have declared the Fifth of Tir (June 26) the international day of support for imprisoned Iranian workers as well as for the institution of unions in Iran. We want that this day be viewed as more than a day for the demands of labor unions to make it a day for human rights in Iran and to ask all our fellow workers to struggle for the trampled rights of the majority of the people of Iran.

And here's a bit of Al's analysis:

It's significant that the bus workers set a date, a week from now, for its International Day of Support for Imprisoned Iranian Workers. The call carries with it a prima facie acknowledgement that no matter what happens in the streets on Saturday, the party is just getting started.

I noticed the date right away when I read the release. As BooMan reminded us a few days ago, the 1979 revolution in Iran took over a year. I know that today (Saturday) is pivotal in how this resistance develops. But with the engagement of the unions and their organizing ability, I'd say it looks like "game on" for the long haul on this one.