Your search within this document for 'plug' resulted in two matching pages.
1

“...had to be disintegrated, a process capitalism will continue to resort to until the rising tide of the social revolution will be- come so strong as to render the efforts of its agents nugatory. After the first convention every succeeding one that the or- ganization has held marked an eruption of some sort until in 1908 the real coup detat was staged and enacted. The I. W. W. passed under the control of an Anarcho-Syndicalist, a physical force element, which had packed the convention with a lot of plug-ugly delegates, many of them representing purely fictitious locals, and had refused to seat properly accredited delegates from bona fide organizations, amongst these De Leon himself. This element, once it found itself in control, promptly Un- did the work of the 1905 convention; the political clause of the preamble, or declaration of principles, was eliminated and the organization placed squarely upon a physical force basis. Sub- sequent history has demonstrated, amply and convincingly, the logical...”
2

“...open-air meetings of the Socialist Labor Party were broken up by the police. Big Chief Devery, then head of the whole police department of New York city, sardonically answered the Sections protest with the reply that the meet- ings of the Socialist Labor Party were interfered with because the Democratic Party had applied to hold meetings on the very same corners a long time ahead of the Socialist Labor Party. On the day of election I saw a Socialist Labor Party chal- lenger at the polls slugged by plug-uglies, such as are not seen by daylight at any other time of the year, but who make their appearance on election day and who appeared in profusion in. that particular election in the 16th A. D. If there be any comrade in the Socialist Labor Party, or one in sympathy with the party, who is blessed or damned with earthly possessions and who may not be contributing much...”