Newly sprung ex-cons and vagrants rousted from other parks are crashing the Occupy Wall Street protest, where gourmet meals are free and boozy, drugfueled parties are on tap, the movement’s leaders griped yesterday. “They’re telling people who leave prison to go to Zuccotti Park,” lamented Daniel Zetah, a leader of the OWS community-relations group. Volunteer Lauren Digioia, 26, said, “We have drug dealing going on here, gang activity, public intoxication. There are a lot of instigators. There are a lot of vultures. “Everyone knows we give out free food and sleeping bags, and it’s a perfect opportunity for squatters.”