How to say "left-wing" in Japanese

• 左翼系さよくけい
  no-adjectiveCovers the 'left-leaning' sense: a person, group, or view that leans left, with a nuance of 'of a left-wing tendency'. Typical context: characterizing a commentator's or organization's political stance. A less common choice.
• 赤色あかいろCommon
  prenominal modifierLiterally 'the color red'; as a political label it corresponds to English 'red', meaning communist or socialist. It is a common word, fitting the 'left-wing = communist' sense rather than a moderate left-leaning stance.

For 'left-wing' meaning communist or socialist, 赤色 (literally 'red') is a common label; 左翼系, a less common word, covers the milder 'left-leaning' sense of a person or group that leans left.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 左翼系さよくけいleft-leaning
• 赤色あかいろcommunist