Related Clues:

• Allies' foe
• Graph line
• Central line
• Common-interest group
• Conservatives or liberals, say, in the Senate
• Line of symmetry
• x or y, e.g.
• x, y or z
• Stem
• Allies' foe in W.W. II
• Pivotal point
• The second cervical vertebra
• Political alliance
• Coordinate system line
• Main line?