More than 100 generous people who wrote checks to charity kept giving till it hurt — without realizing it, The Post has learned.

More than 50 fraudsters will be facing a Manhattan judge today in a $1 million identity-theft and check-fraud ring that targeted people who contributed to worthy causes, law-enforcement sources said.

Manhattan DA Cyrus Vance’s cyber-crimes unit spearheaded the probe that culminated yesterday with dozens of arrests by the NYPD, sources said.

In one early-morning raid, detectives swooped in on a Brooklyn woman, who along with her significant other allegedly bought matching luxury Mercedes-Benzes.

While the thieves never targeted the charities themselves, they put the donors directly in their crosshairs, the sources said.

They somehow gained access to donors’ checks, which provided personal and account information.

Using the data, they allegedly created fraudulent checks and deposited them into the accounts of accomplices.