Assertion: momentum's momentum | /r/CapableOf | describe as a party within a party
Facets:
value: within a party
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: A grassroots reporting project across four local parties demonstrates that Momentum, often described as a “party within a party”, has rapidly become the most powerful force on the ground with Labour members frequently defining themselves as for or against it.