I believed the idea was originally popularised by the slogan “La propriété, c'est le vol”, where vol does translate to theft. But violence would certainly be quite similar to Proudhon‘s original meaning for the phrase.

Marx didn’t like the idea because he said it presupposes that property exists, which he obviously had a problem with. Fun fact, this disagreement was the primary conflict that split the IWA into seperate anarchist and Marxist movements. With the anarchists later going on to adopt national socialism, which at the time was known as fascism.