[n] a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries [n] an ardent and enthusiastic supporter of some person or activity [adj] devoted to a cause or party
biased, enthusiast, guerilla(a), guerrilla(a), irregular, one-sided, partisan, partisan, partisan, party(a), party-spirited, tendencious, tendentious, underground
nonpartisan, nonpartizan