All that I can suggest is to contact the Humane Society, and ASPCA.

Sorry, but I'm going to defend the right to eat cats.  I read
soc.culture.korean and some people ruthlessly attack Koreans for
eating dogs and cats.  I think its perfectly acceptable, our
aversion to it simply being a cultural difference.  I learned in
a class on Indian anthropology that in many Native American
cultures dogs are considered beastly work animals and sheep are
kept as pets instead.  From their perspective it would be
barbaric and cruel to eat a sheep or lamb.  Recently here in Texas
there was an outcry by animal activists protesting the Texas
law that allows horse meat to be exported for human consumption
(federal law prohibits sale of horse meat for human consumption
in the U.S.).  I argued that there is no reason for horses to
be afforded special protection against being eaten.  The ironic
thing is that it remains completely legal to slaughter horses
for use as animal feed, so the federal law doesn't really protect
them at all, only preventing people from eating them.  I should
add that none of the animal rights groups offered any money to
pay for their peaceful retirement and keep them from the chopping
block - as usual they expect everyone else to care for the old
and lame horses.  The only reason I can see to prohibit the
consumption of any species is if it is either endangered or carries
a transmissable disease.

I would think that encouraging the consumption of cats and dogs
would be an excellent way to reduce the stray populations of
those animals.  Of course, that does not give people the right
to steal people's pets for food.  But I would never dream of
eating my kitty!

Here is the website for the ASPCA's Humane Law Enforcement Office in NYC...
http://www.aspca.org/site/PageServer?pagename=hle

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What happened to Animal Cops & Animal Precinct?

Traps are not readily available for purchase in NYC and do you really
think homeless people can afford to buy them at a cost of $40 or more
per trap?

There are several organizations in NYC that participate in ongoing TNR
projects
http://www.neighborhoodcats.org/
What you are probably seeing is traps set to catch cats so they can be
vaccinated, neutered and then returned to the same location, where they
are fed regularly by volunteers. Why don't you find out who is doing the
trapping and, if it is a TNR project, volunteer to help. If it's someone
just trapping strays to try to get rid of them you can contact the
organization I linked to and they will help you set up a TNR project of
your own and hopefully you can educate the other person about this much
better way of doing things.

Megan