mainLeftCoalition

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: mainLeftCoalition

Indicates that an entity serves as the principal left-wing political coalition associated with another entity (such as a country, election, or political context).