For those unfamiliar with third parties in NY, there is a serious corruption problem.
Due to “fusion voting” (where a candidates votes on multiple lines are added together) major parties often attempt to take over third parties so they can control the line and get additional votes. Here’s an example where this abuse came out in the open: Times Union article
We rarely see this with the Greens or Libertarians, though the Greens are at greater risk now that they have a ballot line. It’s most common with the Working Families Party, Conservative Party, and the Independence Party.
A typical way this is done is party leaders will have family members register as members of the relevant third party and use those votes to win primaries and/or party offices. The smaller the third party, the easier it is to take over.
There’s also a tendency for the leadership of these parties to sell out their line for personal benefit.