Published: Sunday, June 23, 2002 Hundreds rally for united L.A. By Susan Abram Staff Writer VALLEY GLEN -- Kicking off one of the largest movements yet to keep Los Angeles whole, Mayor James Hahn, former Mayor Richard Riordan, and religious and community leaders rallied more than 1,000 labor union workers and others Saturday against San Fernando Valley secession. There was a large turn out at a rally at Valley College in opposition to secession. (Gene Blevins / Daily News) With banners proclaiming "United We Stand," janitors, restaurant employees and other union members joined forces with those already committed to the...