diff --git a/NDTensors/src/lib/Sectors/src/Sectors.jl b/NDTensors/src/lib/Sectors/src/Sectors.jl
index cd0a7afb1b..f6c8bca92b 100644
--- a/NDTensors/src/lib/Sectors/src/Sectors.jl
+++ b/NDTensors/src/lib/Sectors/src/Sectors.jl
@@ -1,19 +1,5 @@
 module Sectors
 
-using BlockArrays: blocklengths
-using HalfIntegers: Half, HalfInteger, half, twice
-
-using NDTensors.LabelledNumbers:
-  LabelledInteger, label, label_type, labelled, unlabel, unlabel_type
-using NDTensors.GradedAxes:
-  GradedAxes,
-  blocklabels,
-  dual,
-  fuse_blocklengths,
-  fusion_product,
-  gradedrange,
-  tensor_product
-
 include("symmetry_style.jl")
 include("abstractcategory.jl")
 include("category_definitions/fib.jl")
diff --git a/NDTensors/src/lib/Sectors/src/abstractcategory.jl b/NDTensors/src/lib/Sectors/src/abstractcategory.jl
index 60443de5a7..f650ab22c8 100644
--- a/NDTensors/src/lib/Sectors/src/abstractcategory.jl
+++ b/NDTensors/src/lib/Sectors/src/abstractcategory.jl
@@ -1,6 +1,10 @@
 # This file defines the abstract type AbstractCategory
 # all fusion categories (Z{2}, SU2, Ising...) are subtypes of AbstractCategory
 
+using BlockArrays: blocklengths
+using ..LabelledNumbers: LabelledInteger, label, label_type, labelled, unlabel, unlabel_type
+using ..GradedAxes: GradedAxes, blocklabels, fuse_blocklengths, gradedrange, tensor_product
+
 abstract type AbstractCategory end
 
 # ===================================  Base interface  =====================================
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/fib.jl b/NDTensors/src/lib/Sectors/src/category_definitions/fib.jl
index ff7f69795e..45b2180171 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/fib.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/fib.jl
@@ -3,6 +3,7 @@
 #
 # (same fusion rules as subcategory {0,1} of su2{3})
 #
+using ..GradedAxes: GradedAxes
 
 struct Fib <: AbstractCategory
   l::Int
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/ising.jl b/NDTensors/src/lib/Sectors/src/category_definitions/ising.jl
index 1e7b51ab13..7ce3bcef7d 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/ising.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/ising.jl
@@ -4,6 +4,9 @@
 # (same fusion rules as su2{2})
 #
 
+using HalfIntegers: Half, twice
+using ..GradedAxes: GradedAxes
+
 struct Ising <: AbstractCategory
   l::Half{Int}
 end
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/o2.jl b/NDTensors/src/lib/Sectors/src/category_definitions/o2.jl
index eb31227265..872f8cdd42 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/o2.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/o2.jl
@@ -9,6 +9,9 @@
 # - 2-dimensional Sz=±|m| irrep, with m a half integer
 #
 
+using HalfIntegers: Half, HalfInteger
+using ..GradedAxes: GradedAxes
+
 # here we use only one half-integer as label:
 # - l=0 for trivial
 # - l=-1 for zero odd
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/su.jl b/NDTensors/src/lib/Sectors/src/category_definitions/su.jl
index c83a13a48c..880a2780f0 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/su.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/su.jl
@@ -2,6 +2,9 @@
 # Special unitary group SU(N)
 #
 
+using HalfIntegers: HalfInteger, half, twice
+using ...GradedAxes: GradedAxes
+
 struct SU{N,M} <: AbstractCategory
   # l is the first row of the
   # Gelfand-Tsetlin (GT) pattern describing
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/su2k.jl b/NDTensors/src/lib/Sectors/src/category_definitions/su2k.jl
index 9570d7bcfa..ffcf4c5550 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/su2k.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/su2k.jl
@@ -2,6 +2,9 @@
 # Quantum 'group' su2ₖ
 #
 
+using HalfIntegers: Half
+using ...GradedAxes: GradedAxes
+
 struct su2{k} <: AbstractCategory
   j::Half{Int}
 end
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/u1.jl b/NDTensors/src/lib/Sectors/src/category_definitions/u1.jl
index 055b08f630..672fe0655d 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/u1.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/u1.jl
@@ -2,6 +2,8 @@
 # U₁ group (circle group, or particle number, total Sz etc.)
 #
 
+using ...GradedAxes: GradedAxes
+
 # Parametric type to allow both integer label as well as
 # HalfInteger for easy conversion to/from SU(2)
 struct U1{T} <: AbstractCategory
diff --git a/NDTensors/src/lib/Sectors/src/category_definitions/zn.jl b/NDTensors/src/lib/Sectors/src/category_definitions/zn.jl
index 665080b73d..25299703e3 100644
--- a/NDTensors/src/lib/Sectors/src/category_definitions/zn.jl
+++ b/NDTensors/src/lib/Sectors/src/category_definitions/zn.jl
@@ -2,6 +2,8 @@
 # Cyclic group Zₙ
 #
 
+using ...GradedAxes: GradedAxes
+
 struct Z{N} <: AbstractCategory
   m::Int
   Z{N}(m) where {N} = new{N}(m % N)
diff --git a/NDTensors/src/lib/Sectors/src/category_product.jl b/NDTensors/src/lib/Sectors/src/category_product.jl
index d34c7888e8..309f8a512f 100644
--- a/NDTensors/src/lib/Sectors/src/category_product.jl
+++ b/NDTensors/src/lib/Sectors/src/category_product.jl
@@ -1,6 +1,10 @@
 # This files defines a structure for Cartesian product of 2 or more fusion categories
 # e.g. U(1)×U(1), U(1)×SU2(2)×SU(3)
 
+using BlockArrays: blocklengths
+using ..LabelledNumbers: LabelledInteger, label, labelled, unlabel
+using ..GradedAxes: GradedAxes, dual
+
 # =====================================  Definition  =======================================
 struct CategoryProduct{Categories} <: AbstractCategory
   cats::Categories
diff --git a/NDTensors/src/lib/Sectors/src/symmetry_style.jl b/NDTensors/src/lib/Sectors/src/symmetry_style.jl
index 417c506c6d..944fc0fe28 100644
--- a/NDTensors/src/lib/Sectors/src/symmetry_style.jl
+++ b/NDTensors/src/lib/Sectors/src/symmetry_style.jl
@@ -1,6 +1,8 @@
 # This file defines SymmetryStyle, a trait to distinguish abelian groups, non-abelian groups
 # and non-group fusion categories.
 
+using ..LabelledNumbers: LabelledInteger, label
+
 abstract type SymmetryStyle end
 
 struct AbelianGroup <: SymmetryStyle end