It's no secret that labor unions are struggling with declining membership and loss of negotiating clout, but don't tell that to the hundreds of activists who gathered Friday for a rally outside the Hilton Hotel at Los Angeles International Airport...

Analysts note that the city is a major entry point for immigrants, legal and otherwise, who tend to work at low-wage jobs in numbers large enough to have some collective impact. It has active environmental and religious communities, which are increasingly taking up the causes of the poor. Moreover, they say, an exodus by much of the middle class leaves a city in which the contrast between Hollywood's megarich and South Central's slipping poor is acute and, to many, disturbing...

"The big targets for unionization in L.A. are getting smaller," says economist Joel Kotkin, Irvine senior fellow at the New America Foundation who writes on economic, political, and social trends. "Outside the big public projects, you don't see a lot of union labor, and you are not going to organize day laborers [standing] outside Costco. Since many of the workers don't vote, aren't citizens, and make low wages, the unions are going to have somewhat less money and clout than the industrial unions of before..."

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