diff --git a/include/fbgemm/Fbgemm.h b/include/fbgemm/Fbgemm.h
index 9a7e1bee7f..eb1f3a01b7 100644
--- a/include/fbgemm/Fbgemm.h
+++ b/include/fbgemm/Fbgemm.h
@@ -77,6 +77,10 @@ template <typename PT, typename inpType, typename accType = std::int32_t>
 class PackMatrix {
  public:
   PackMatrix() = delete; // no default constructor
+  PackMatrix(const PackMatrix&) = delete; // no copy
+  PackMatrix& operator==(const PackMatrix&) = delete; // no copy
+  PackMatrix(PackMatrix&&) = delete; // no move
+  PackMatrix& operator==(PackMatrix&& rhs) noexcept = delete; // no move
 
   /**
    * @param rows total number of rows in the matrix
@@ -296,7 +300,7 @@ class PackMatrix {
   std::int32_t bcol_; ///< the number of columns in each block
   std::int32_t nbrow_; ///< the number of blocks along rows
   std::int32_t nbcol_; ///< the number of blocks along columns
-  bool bufAllocatedHere_;
+  bool bufAllocatedHere_{false};
   const BlockingFactors*
       blocking_params; ///< MCB, KCB, NCB, MR, NR, NR_MIN, ROW_INTERLEAVE;
 
@@ -505,6 +509,13 @@ class FBGEMM_API PackWeightMatrixForGConv {
   using accType = accT;
 
   PackWeightMatrixForGConv() = delete; // no default constructor
+  PackWeightMatrixForGConv(const PackWeightMatrixForGConv&) = delete; // no copy
+  PackWeightMatrixForGConv& operator==(const PackWeightMatrixForGConv&) =
+      delete; // no copy
+
+  PackWeightMatrixForGConv(PackWeightMatrixForGConv&&) = delete; // no move
+  PackWeightMatrixForGConv& operator==(PackWeightMatrixForGConv&&) =
+      delete; // no move
 
   /**
    * @param pmat if nullptr, a buffer is allocated and owned by this class.
@@ -550,7 +561,7 @@ class FBGEMM_API PackWeightMatrixForGConv {
   const conv_param_t<SPATIAL_DIM> conv_param_;
   const T* sdata_;
   T* pdata_;
-  bool bufAllocatedHere_;
+  bool bufAllocatedHere_{false};
   // Number of groups we work at a time to fill the full simd width
   int GTogether_;
 
@@ -836,8 +847,8 @@ class FBGEMM_API PackAWithRowOffset final
   matrix_op_t trans_;
   const T* smat_;
   std::uint32_t ld_;
-  std::int32_t* row_offset_;
-  bool rowOffsetAllocatedHere;
+  std::int32_t* row_offset_{nullptr};
+  bool rowOffsetAllocatedHere{false};
   std::int32_t row_interleave_B_;
 };
 
@@ -930,8 +941,8 @@ class FBGEMM_API PackAWithQuantRowOffset final
   std::int32_t ld_;
   float scale_;
   std::int32_t zero_pt_;
-  std::int32_t* row_offset_;
-  bool rowOffsetAllocatedHere;
+  std::int32_t* row_offset_{nullptr};
+  bool rowOffsetAllocatedHere{false};
   std::int32_t row_interleave_B_;
 };