India, April 15 -- A beer drought could be looming over New York City, and not because of a shortage at the breweries. Unionized workers at Manhattan Beer & Beverage Distributors are on the brink of a strike, threatening the flow of hundreds of beer brands to bars, restaurants, and corner stores across the Big Apple.

The 600 or so workers, who are represented by Teamsters Local 812, may walk off the job as soon as midnight Tuesday with a dispute over pensions. The union claims the company is trying to push workers out of their current pension plan and onto a 401(k)-style retirement scheme.

"Keep your hands off our pensions," union co-manager Alberto Arroyo told The New York Post.

Manhattan Beer has exclusive rights to deliver some of t...