The article it cites says this (emphasis added):

> For much of its history, the ADL has operated in the United States as if it were a hostile intelligence organization—which, in essence, it was. The organization’s spymaster was Irwin Suall, who from the 1960s to 1997 ran his nationwide network of agents and informants from the ADL’s New York City headquarters. As millions of dollars in donations flowed into the “civil rights” organization, tens of thousands of dollars flowed out to Suall’s clandestine operatives in the field, actively engaged in violating the civil rights of thousands of Americans. Among his agents was Roy Bullock, a beefy San Franciscan with the codename “Cal” who posed as a small-time art dealer in the Castro District and spied undercover in the US for the ADL. To hide the ADL’s involvement, Bullock’s payments were laundered through a Beverly Hills attorney who, Bullock would later tell authorities, never missed a payment in more than three decades. Bullock said he would submit his reports to the ADL’s executive director in San Francisco, Richard Hirschhaut, now the regional director of the American Jewish Committee for Los Angeles.

This supports the stated claim. You can dispute the facts in this citation, of course (I don’t take them as the gospel truth myself), but The Cradle didn’t cite it incorrectly.

Acting like a hostile intelligence agency != being a front for Israeli intelligence