In a committee there are $n$ members. Each pair of members are either friends or enemies. Each committee member has exactly three enemies. It is also known that for each committee member, an enemy of his friend is automatically his own enemy. Find all possible value(s) of $n$
1. **Understanding the Problem:**
   - We have a committee with \( n \) members.
   - Each pair of members are either friends or enemies.
   - Each member has exactly three enemies.
   - An enemy of a friend is also an enemy of the member.

2. **Initial Observations:**
   - Each member has exactly three enemies, so the sum of the degrees of the vertices in the graph is \( 3n \).
   - Each edge in the graph contributes 2 to the sum of the degrees, so the total number of edges is \( \frac{3n}{2} \). This implies \( n \) must be even.

3. **Case Analysis:**
   - **Case \( n = 4 \):**
     - If \( n = 4 \), each member has exactly 3 enemies. This means every member is an enemy to every other member. This forms a complete graph \( K_4 \) where every member is an enemy to every other member.
     - This satisfies the condition that each member has exactly 3 enemies.

   - **Case \( n = 6 \):**
     - If \( n = 6 \), we need to check if we can partition the members into groups such that each member has exactly 3 enemies.
     - One possible partition is to split the 6 members into two groups of 3, where each member in one group is an enemy to every member in the other group. This forms two complete subgraphs \( K_3 \) and \( K_3 \).
     - Each member in one \( K_3 \) has exactly 3 enemies in the other \( K_3 \), satisfying the condition.

4. **Proof for Larger \( n \):**
   - Assume \( n > 6 \). Each member has \( n-4 \) friends and 3 enemies.
   - If \( n > 6 \), then each member must be part of a complete subgraph \( K_{n-3} \).
   - Since \( n-3 \) is greater than half of \( n \), each member must be part of a complete graph that consists of more than half the members.
   - However, we can only form at most one \( K_{n-3} \), so only \( n-3 \) members can be in a \( K_{n-3} \). This leads to a contradiction because we cannot satisfy the condition for all members.

5. **Conclusion:**
   - The only possible values for \( n \) that satisfy the given conditions are \( n = 4 \) and \( n = 6 \).

The final answer is \( \boxed{n = 4, 6} \).