New York’s largest transit union is making preparations to launch legal action against Mayor Adams’ top aide, Randy Mastro, and several other politically-connected individuals amid an escalating dispute over the future of the city’s horse carriage industry.

A lawyer for the Transport Workers Union , which advocates for city horse carriage drivers and opposes a ban, disclosed its plans to sue in letters sent this week to Mastro and several others. The letters, copies of which were obtained by the Daily News, claim Mastro and the others were involved in a “deceptive enterprise,” though they don’t go into detail about the allegations. The letters demand the recipients preserve records related to their effort to outlaw the carriage industry.

The missives were sent after The News reported

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